
Kathryn Vale, a former movie star living in seclusion, harbors a dark secret and has a daughter who dreams of following in her footsteps. Seeking a career resurgence, Kathryn finds herself targeted by an anonymous blackmailer, which forces her to face unsettling truths about her past and the people in her life. The escalating situation reveals hidden relationships and long-buried secrets within her family.
Does The Devil You Know have end credit scenes?
No!
The Devil You Know does not have end credit scenes. You can leave when the credits roll.
Explore the complete cast of The Devil You Know, including both lead and supporting actors. Learn who plays each character, discover their past roles and achievements, and find out what makes this ensemble cast stand out in the world of film and television.

Dean Winters
Jake Kelly

Jennifer Lawrence
Young Zoe

Rosamund Pike
Zoe Hughes

Lena Olin
Kathryn Vale

Bern Cohen
Humphrey Smith

Alan Coates
Dr. Seger

Kit Flanagan
Casting Director

Eric Zuckerman
Assistant Director

Barbara Garrick
Joan Stone

Molly Price
Edie Fontaine

Stephen Gevedon
Max Pierce

Annika Peterson
Miranda

Michael Pemberton
Gus Carlson

Matthew Faber
Harry

Charlie V. Wilson
Maître d'
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Challenge your knowledge of The Devil You Know with this fun and interactive movie quiz. Test yourself on key plot points, iconic characters, hidden details, and memorable moments to see how well you really know the film.
Who plays the ambitious actress Zoe Hughes?
Rosamund Pike
Lena Olin
Meryl Streep
Emily Blunt
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Read the complete plot summary of The Devil You Know, including all major events, twists, and the full ending explained in detail. Explore key characters, themes, hidden meanings, and everything you need to understand the story from beginning to end.
The movie opens with Zoe Hughes, Rosamund Pike, peering through the bushes with an unreadable, almost haunted expression—a moment that hints at a mind both calculating and exhausted by a life lived in the glare of fame. A film crew nearby seems disgruntled by Zoe’s performance, their mood shifting abruptly when a surprise visit arrives from Zoe’s mother, Kathryn Vale, Lena Olin. The elder star, a legendary A-list actress with a fresh husband and a successful book to her name, looms large over the production and over Zoe’s own ambitions. Zoe longs to carve out a name beyond the shadow of Kathryn’s storied career, but the pressure of living up to a Hollywood-icon mother weighs heavily on every choice she makes.
Zoe’s attempts to provoke jealousy by pretending she’s overtaken her mother’s success are careful and brittle at first, a game of appearances that only amplifies the distance between them. After a hollow lie about a supposedly stellar audition, Zoe discovers Kathryn’s reaction mixed with a stubborn, renewed pride—the kind of reaction that fuels Kathryn’s return to show business and deepens Zoe’s sense of inadequacy. Amid this tense dance, Zoe’s affair with Kathryn’s new husband, Jake, Dean Winters, adds a dangerous tension to every conversation and every shared room. Jake’s casual indifference—“he does not miss Zoe when he is with his wife”—cuts deeply into Zoe, who feels both drawn to and rejected by the man who should be her ally and confidant.
The pressure builds until the harassment takes a tangible form: threatening letters that push Kathryn toward retreat, away from the studio lights and into a secluded mansion in the woods. There, Kathryn’s trusted assistant Edie Fontaine, Molly Price, joins her side by side in the isolation. The setting grows even more eerie as flashbacks unfold: a younger, more reckless Zoe, in the throes of a reckless urge to outshine her mother, seduces and murders Kathryn’s former husband, a revelation that reframes every later choice as a quest for control and revenge. Edie and Zoe hatch a plan to rip at the ties that bind Kathryn to Jake, spreading doubt about Jake’s innocence through the very letters that were meant to terrify Kathryn into submission.
In the quiet of the mansion, the house wakes to gunshots in the dead of night. Edie hurries to Zoe’s faltering body, and Jake—having glimpsed the crime scene—races to shield Kathryn from the horror unfolding before them. Kathryn’s fear gives way to cold resolve as she confronts Edie and Jake, demanding answers. It is then revealed in the chaos that Zoe is alive, and she uses the moment of interrogation to exact revenge by killing Jake. As the smoke clears, Zoe proclaims that she had anticipated Kathryn’s loss of trust in Jake for a long time, and she seizes the moment to escape the aftermath. Kathryn, unmoved, walks away with a measured smirk, choosing not to shield her daughter from the consequences of her actions, leaving Zoe to face the consequences of her own craftiness and deceit.
The horror of the night lingers as the pursuit of justice looms. Zoe pleads with her mother for help as the police close in, but Kathryn’s decision to walk away—alone, composed, and victorious in a grim way—signals a rupture that cannot be repaired. A year later, Kathryn and Edie sit in the back of a limo, basking in the glow of Kathryn’s triumphant return to the screen. A broadcast voice quietly celebrates Kathryn Vale’s Oscar nomination, a testament to public sympathy and the enduring pull of a life lived under the brightest of spotlights. The film closes on the uneasy balance between power and vulnerability, fame and manipulation, as a public rejoices while a daughter contends with the intimate costs of a mother’s legacy, a story that lingers long after the credits roll.
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