All the Colors of the Dark 1972

Jane Harrison Jane Harrison lives in London with her boyfriend Richard Steele Richard Steele, a pharmaceutical salesman who travels frequently for work. After losing her unborn child in a car accident, Jane has been unable to have sex with Richard, all while carrying the heavy trauma of witnessing her mother’s murder when she was younger. Despite Richard’s skepticism about psychiatry, Jane’s sister Barbara Harrison Barbara Harrison arranges a session with a psychiatrist, Dr. Burton Dr. Burton, whom Barbara works for. In the session, Jane confides that she’s been haunted by nightmares of a sinister man with piercing blue eyes who murdered her mother, insisting she’s glimpsed the same man in the waiting room.

After encountering the blue-eyed man twice on her walk home, Jane meets Mary Weil, a mysterious woman who has just moved into her building. Jane shares her troubles with Mary, and soon the blue-eyed figure resurfaces, attempting to kill Jane with an axe. Under Mary’s seemingly supportive guise, she is taken to a castle where a Satanic cult led by J. P. McBain J. P. McBain is enacting a Black Mass. The ritual is shocking: a puppy is sacrificed, Jane drinks its blood, and J. P. forces himself on her, all while the other members look on. That night, Jane and Richard manage to reignite their intimacy, but the next day, Jane narrowly escapes the blue-eyed man again and flees in a taxi.

Jane’s involvement with the cult continues, and she is revolted by the latest ritual when it ends in Mary’s sacrifice. After waking in a field, the blue-eyed man, revealed as Mark Cogan Mark Cogan, brings Jane back to J. P., who explains that Mary allowed herself to be sacrificed so Jane could be drawn into the cult—the only way to leave it. In a tense sequence, Jane is attacked by two German Shepherds before Mark sedates her. She awakens back in her own bed and rushes to Mary’s apartment, which has been taken over by an elderly neighbor.

One night, with both Richard and Barbara away, Jane visits Dr. Burton’s office and recounts the disturbing events. Although the doctor dismisses the episodes as nightmares, he allows Jane to spend the night at his country house with an elderly couple who work as housekeepers. The next day, Richard returns to find Jane missing, prompting him to call Barbara. Meanwhile, Jane awakens to find the housekeepers murdered. She phones Dr. Burton, who is later seen driving to his country house with Richard and Barbara. In a private moment, Dr. Burton tells Barbara that it was Jane on the line. As the doctor drives away, Richard follows him.

Soon after, Mark reveals a darker lineage: Jane’s mother was a member of the cult and was killed when she tried to escape. Dr. Burton is found murdered in his car, setting off a desperate chase through the woods. Mark pursues Jane, but Richard intervenes, fatally stabbing Mark with a pitchfork and noticing a tattoo on Mark’s wrist. Richard later confronts Barbara at her apartment, having spotted that she bears the same tattoo. As Barbara reaches for a hidden gun and tries to persuade Richard to join the cult, he shoots her dead when she leans in for a kiss.

At the hospital, Jane experiences a nightmare in which she is framed by the cult for Richard’s murder, with J. P. McBain posing as a police inspector. When she awakens, the policemen reveal that the cult was a front for a drug ring and that Barbara was the mastermind behind it. They also disclose that the man who killed Jane and Barbara’s mother died two months earlier and left an inheritance to both sisters, a detail Barbara had planned to exploit to eliminate Jane and claim the entire inheritance for herself. Returning home, Jane and Richard confront J. P., who attacks Richard. A rooftop pursuit ends with Richard throwing J. P. to his death, bringing a brutal end to the cult’s scheme.