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Read the complete plot summary and ending explained for The Midnight Swim (2015). From turning points to emotional moments, uncover what really happened and why it matters.
February 2049, three weeks after “the event” – a radioactive meltdown that has destroyed most of the world. Augustine Lofthouse (George Clooney) is a terminally ill scientist who stays behind at the Barbeau Observatory as all the other citizens are evacuating via helicopter, including a mother searching for her daughter – but the woman is told her daughter got on an earlier ride. Augustine lives alone at the facility, taking his medications, doing dialysis, and using the facility to see if any of the exploratory space missions looking for hospitable planets are still active. He finds that one mission, Aether, is still active.
The film flashes back decades earlier, where a young Augustine (Ethan Peck) presents his research on what other planets might be habitable for human life. After the presentation, Jean (Sophie Rundle) approaches him and asks him how much what he’s researching could be actually real. Meanwhile, one of the astronauts on the Aether mission, Sully (Felicity Jones), is pregnant and has a nightmare she’s been left on the planet that they were exploring, K-23. The others on the mission are Captain Gordon (David Oyelowo), Maya (Tiffany Boone), Sanchez (Demian Bechir), and Mitchell (Kyle Chandler). Sully tells the rest of them that she is unable yet to get any signal to communicate with Earth or anyone else.
At Barbeau, Augustine finds a young girl (Caoilinn Springall) hiding in the facility. He attempts to contact someone to come back to retrieve her but cannot get in contact with anyone. She doesn’t say a word, but when she draws a picture on a flower, he realizes her name is Iris. He explains to her that Aether is coming back and he needs to warn them about what has happened on Earth. The antenna is not strong enough and Augustine fails to communicate. Augustine tells Iris if she’s lost to always look at the star Polaris to find her way.
Gordon notes in his captain’s log that K-23 was a success, it could sustain life, but the inability to communicate with home – or anyone at all – is troubling. Meanwhile, in another flashback, Jean and Augustine are in a relationship but he is cold and only focused on his work, neglecting his own life. He barely reacts when she tells him she isn’t pregnant after a pregnancy scare, and she leaves him. In the present day, Augustine tells Iris there is one antenna that is stronger than the one at Barbeau since it is farther north and the air space might be clearer. He warns her it will be a long journey. He packs his dialysis machine and the two of them venture off into the brutal arctic cold to find the other station.
On the Aether mission, an alarm goes off alerting the team that they have gone off course, and all hands go on deck. They try to stop the drifting by plotting a course through an unmapped and uncleared zone territory, a dangerous and risky tactic.
Meanwhile, Augustine and Iris camp out overnight in the frozen tundra and the next day Augustine finds a downed aircraft, the pilot dead inside. He explores the hull and finds a man alive but dying. The man asks Augustine to execute him, and he does.
More flashbacks reveal that Jean did indeed have a daughter, who she raises alone. Augustine sees them and wants to know if she knows about him – Jean tells him if he wants their daughter to know about him he can introduce himself. On the Aether mission, Maya gives Sully an ultrasound, and Sully tells Gordon that they’re having a girl. Augustine and Sully find another space to spend the night, a trailer, and Augustine asks Iris to ask him a question, which she does – when he wakes and finds the trailer is filling with water. He manages to rescue Iris, but then the trailer and their vehicle sink into the ice, taking the dialysis machine with them.
They hide out in an ice cave and eat what little food they have remaining. They get caught in an icy wind storm that is essentially blinding, and Augustine loses Iris. He hears the sound of wolves and fires off a warning shot to scare them off. He calls out for Iris but cannot find her and collapses into the ground. He sees a vision of Jean appearing to him, but when he looks again it is Iris. He hugs her and they continue traveling, finally finding the other station.
In space, Mitchell congratulates Gordon on the baby girl, and tells him to name the baby Hyacinth after his mother – or “some kind of flower”. Sully finally begins getting a signal and begins communicating with Augustine at the new station. She asks for information on why they can’t communicate with NASA – Augustine begins telling Sully about what has happened to Earth when a red alert goes off – the ship is being pelted with meteorites, a consequence of them going through uncharted space. They make it through the meteor shower, but the ship has sustained damage and Sully has lost communications and radar.
The communications and radar damage means that one of the crew will need to do a spacewalk in order to fix it. Maya and Sully need to go, and Gordon accompanies them. The three begin making repairs on the outside of the ship. For inspiration, Sanchez plays “Sweet Caroline” through their headsets. They fix the radar and comms just as the ship is hit by more meteorites. They brace for impact and all manage to survive, but as they’re walking back into the ship Maya notices blood floating inside her helmet.
Gordon quickly gets her inside the airlock and are forced to wait for it to depressurize to help her while in the ship Sanchez races to get a medkit. When they finally do, they take her helmet off, and hundreds of drops of blood float out. Sanchez puts pressure on the wound while Sully tries to talk to her and keep her conscious, but Maya does not survive. The crew is devastated. There is a machine that plays memories of home for the crew, and Sanchez goes to it and plays Maya’s. As Mitchell pilots the shit and it approaches Earth, the crew finally sees that much of the Earth is smoking and destroyed.
Sully returns to the communications and radios back to Earth, where Augustine is dying without his dialysis machine. He tells them the only survivable areas are underground, and those are temporary. Most of the crew wants to go back to K-23, since Augustine has said Earth is unlivable, but Mitchell, who has a wife and kids, wants to go home. They receive a transmission from Mitchell’s wife just as the Earth was melting down saying that the kids are sick and she wants him to know where she’s going.
Mitchell tells Gordon he understands Gordon should go back to K-23 – Mitchell decides to take a re-entry pod to go to Earth to find his family. Sanchez tells him the pod needs two pilots and will go with him. Mitchell thinks he should stay – Sanchez tells him that his daughter died when he was four and he thought of Maya as a daughter to him and that he wants to take Maya home. Mitchell understands and agrees that they will go together. They say goodbye to Sully and Gordon and leave for Earth.
Sully makes a final communication to Augustine to thank him for what he’s done and how he’s one of the reasons she joined the space program, and that he worked with her mother, Jean. Augustine realizes she is his daughter – Sully says her named is Iris Sullivan – Sully for short. Flashbacks show that Iris is actually Jean and Augustine’s daughter. He tells her how nice it is to finally meet her. He asks her what K-23 is like, and she describes the planet to him. Augustine imagines being on the planet with Young Iris.
Sully speaks to Augustine but gets no response – perhaps he has finally succumbed to his illness – and she and Gordon realize its just the two of them and begin plotting a course for K-23.
Follow the complete movie timeline of The Midnight Swim (2015) with every major event in chronological order. Great for understanding complex plots and story progression.
The Event
In February 2049, a catastrophic radioactive meltdown devastates Earth, leading to mass evacuations. Most of the remaining population flees via helicopters, leaving behind those unable to escape, including scientist Augustine Lofthouse.
Augustine's Isolation
Augustine, who is terminally ill, remains alone at the Barbeau Observatory. He spends his days taking medications and running dialysis while monitoring exploratory space missions for signs of life.
Discovering Aether
While searching mission logs, Augustine learns that the Aether mission is still operational. This discovery ignites a spark of hope and a sense of urgency in him to contact the mission and warn them about Earth's dire situation.
Flashback to Young Augustine
The narrative flashes back to Augustine's younger days, where he presents his research on habitable planets. During this presentation, he meets Jean, a pivotal figure in his life who questions the legitimacy of his work.
Communication Challenges
On the Aether mission, astronaut Sully experiences a haunting nightmare of being abandoned on K-23. The crew struggles with communication failures as they seek to establish a link with Earth.
Meeting Iris
Augustine discovers a young girl hiding in the observatory, later named Iris. Despite her silence, Augustine forms a connection with her and is determined to protect her as they navigate their treacherous environment.
Journey to the North
Augustine and Iris embark on a perilous journey to find a stronger antenna to reach the Aether spacecraft. With only their survival skills and limited supplies, they venture into the harsh arctic landscape.
The Downed Aircraft
While traversing the tundra, Augustine discovers a crashed aircraft with a dying pilot inside. Faced with an impossible decision, he ultimately fulfills the man's wish for a merciful end.
The Loss of Communication
As the Aether crew faces external threats in uncharted space, they grapple with a sudden loss of communications. This malfunction threatens their safety and complicates their mission.
Maya's Tragic Fate
During a critical spacewalk to repair the spacecraft, one crew member, Maya, is severely injured by debris. Despite the crew's frantic efforts to save her, she tragically succumbs to her injuries, leaving the crew devastated.
Revelation of a Daughter
In a heart-wrenching revelation, Sully communicates with Augustine, revealing she's his daughter Iris Sullivan. This connection deepens Augustine's resolve to assist her in the midst of chaos.
Mitchell's Farewell
Mitchell, torn between duty and family, volunteers for a risky re-entry to Earth. This decision leads to a poignant farewell as he and Sanchez leave the crew, prioritizing their loved ones over the mission.
Facing the Icy Storm
Augustine and Iris are caught in an intense icy storm, leading Augustine to momentarily lose sight of her. In his desperate search, he experiences a vision of Jean, showcasing his emotional turmoil and longing.
Final Communications
As Gustav is close to death, he manages to send final communications to Sully, urging her to flee to the habitable planet. This crucial information paves the way for her and the surviving crew members to attempt a new course.
Breaking Through
With newfound determination, Sully and Gordon construct a course for K-23. Their mission for survival and the hope for a habitable future culminates in a final push against all odds.
Explore all characters from The Midnight Swim (2015). Get detailed profiles with their roles, arcs, and key relationships explained.
Augustine Lofthouse (George Clooney)
Augustine Lofthouse is a terminally ill scientist, grappling with his own mortality while stubbornly focusing on his research and the survival of humanity. His character embodies both regret and determination, shaped by his past relationship and the burden of knowledge about Earth's devastation. He becomes a guardian figure to Iris, showcasing a protective and nurturing side as they navigate their perilous journey.
Sully (Felicity Jones)
Sully is an astronaut on the Aether mission, pregnant and filled with determination despite the daunting circumstances. Her character represents resilience and the hope of new life in an inhospitable universe. Throughout the film, she displays strength in the face of adversity and carries the emotional weight of her connection to Augustine, which is revealed later as his daughter.
Iris (Caoilinn Springall)
Iris is a young girl who becomes a companion to Augustine during their treacherous journey. Though she is initially mute, her presence brings out Augustine’s paternal instincts and vulnerability. Iris represents innocence and hope as they search for safety, and her drawings reflect an emotional depth in the context of their otherwise bleak environment.
Learn where and when The Midnight Swim (2015) takes place. Explore the film’s settings, era, and how they shape the narrative.
Time period
February 2049
The movie takes place in a post-apocalyptic future, three weeks after a catastrophic radioactive meltdown that has devastated Earth. This time period is marked by desperation, survival, and the quest for human existence beyond a dying planet.
Location
Barbeau Observatory, K-23
Barbeau Observatory is a remote scientific facility that has become a refuge for Augustine in the aftermath of a global disaster. It serves as a research point for space missions and plays a crucial role in Augustine's quest for communication with the outside world. K-23, on the other hand, is an alien planet explored by the Aether mission, which is discovered to have the potential to support human life.
Discover the main themes in The Midnight Swim (2015). Analyze the deeper meanings, emotional layers, and social commentary behind the film.
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Survival
Survival is a central theme of the film, shown through Augustine's fight against time and illness as well as his determination to protect the young girl, Iris. The harsh Arctic environment further intensifies the struggle for life, highlighting the lengths people go to in order to find hope amidst despair. The theme also extends to the astronauts as they confront life-threatening challenges on their mission.
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Parenthood
The theme of parenthood is poignantly explored through Augustine's relationship with his daughter, Sully, and his own regrets. As he bonds with Iris, the film reflects on the sacrifices parents make and the emotional connections that persist despite obstacles. This theme bridges the narrative between past and present, showcasing the longing for familial bonds in a time of crisis.
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Hope
Hope emerges as a powerful theme, particularly seen through the characters' resolve to seek a future on K-23 and the possibilities of finding life beyond Earth. Augustine's dedication to contacting the space mission exemplifies the hope for human survival and new beginnings, despite the bleakness of their current reality.

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Discover the spoiler-free summary of The Midnight Swim (2015). Get a concise overview without any spoilers.
In the isolated town that clings to the mist‑shrouded banks of Spirit Lake, the sudden vanishing of Dr. Amelia Brooks casts a long, uneasy shadow over the community. Once a respected scientist, Amelia’s disappearance becomes the catalyst for a haunting investigation that draws her three daughters back to the place they thought they had left behind. The lake itself is a character of its own—its glassy surface and the eerie stillness beneath it hint at stories that have been whispered through generations, suggesting that the water holds more than just reflections.
Each daughter arrives with her own blend of skepticism, grief, and lingering affection, forming a fragile partnership as they confront the unsettling atmosphere that pervades the lake and its surroundings. Their differing perspectives create a tension‑filled dynamic that drives the narrative forward, while the town’s quiet residents and the weight of local folklore add layers of mystery. The film’s tone balances a slow‑burning dread with moments of fragile hope, inviting viewers to feel the pull of the unknown as the sisters wade deeper into the lake’s mystique.
“The Midnight Swim” unfolds as a contemplative thriller, where the natural beauty of Spirit Lake is juxtaposed against the dark secrets it conceals. The story leans heavily on mood and atmosphere, using the relentless fog, the echoing calls of wildlife, and the endless horizon to amplify the sense of isolation. As the daughters pursue answers, the audience is left to wonder what lies beneath the water’s surface—and whether the truth they seek will bring closure or plunge them further into the lake’s enigmatic depths.
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