PSYCHOMANIA

Tom Latham, an amiable psychopath, is the leader of a violent youth gang named The Living Dead, which includes his girlfriend Abby. Tom dabbles in black magic and spends much of his free time at an ancient Surrey countryside ruin known as The Seven Witches, a Stonehenge-like circle of standing stones. In a similar vein, his mother and her sinister butler Shadwell get their kicks out of holding séances in their home while they worship the Frog God. Tom's father vanished in a mysterious room shortly after Tom's birth, a room Tom enters on his eighteenth birthday and where he sees the Frog God.

This incident leads to Tom committing suicide and, with his mother's help, returns from the dead. Being one of the undead means that Tom cannot be killed and has superhuman strength, which he demonstrates when he massacres those at a local pub. One by one, his fellow rocker bikers commit suicide with the goal of returning as one of the "undead", gathering at The Seven Witches to plan their campaign of terror against the locals. Only Abby refuses to participate.

Police Chief Inspector Hesseltine is overwhelmed by the crime wave committed by bikers who are known to be dead; believing that someone is stealing the corpses of the dead bikers, he releases a false report that Abby has died. Hesseltine and his force plan to trap the culprit when he shows up to claim Abby. The Living Dead kill the policemen, while seizing Abby. However, Tom's mother, disgusted with her son's crimes, decides to break her bargain with the Frog God.

The gang tell Abby to commit suicide, but she again refuses, instead shooting Tom, who is immune. As Tom prepares to kill Abby, his mother performs a ritual that breaks the pact. Tom's mother is transformed into a frog while the undead bikers are turned into stone, becoming new statues at The Seven Witches. As Abby is left distraught, surrounded by those that once were her friends, a car pulls up and Shadwell gets out, approaching the girl, leaving her fate ambiguous.

Tom’s mother performs a ritual that breaks the pact with the Frog God, transforming herself into a frog and turning the undead bikers into stone statues, leaving Abby alone and Shadwell approaching her as the film closes.

The finale brings the gang’s supernatural rampage to an abrupt end as the occult bargain unravels. The turning of the undead to stone at The Seven Witches underscores the film’s folk horror roots, while Tom’s mother’s transformation into a frog is a poetic punishment for meddling with dark forces. Abby’s ambiguous fate and Shadwell’s approach leave the story lingering in a space between tragedy and ongoing menace.