STOP ME BEFORE I KILL!

English racing driver Alan Colby and his wife Denise were involved in a bad accident a year ago. Although they are both physically well, Alan struggles with mood swings and is increasingly violent. The couple travel to the Côte D'Azur on vacation where they meet Dr. Prade, a psychiatrist also from London. Denise discusses her troubled marriage with Prade, which angers Alan. After a fight, the couple reconcile and return to London.

Alan attempts to strangle Denise and is immediately horrified by his dark impulses. She begs him to seek help from Prade, and he reluctantly agrees. In an early session, Prade presses Alan to reveal how he would kill Denise. Alan confesses all of the details of his fantasy, which includes strangling Denise in bed, dismembering her body and dropping the pieces down a disposal chute in their apartment building.

After many sessions, Prade concludes that Alan believed that he had killed Denise at the moment of the crash and has been reliving those feelings ever since. Alan is ecstatic when Prade declares him cured.

Alan awakens the next morning and is surprised to find Prade in his apartment. He returns a key that Denise had given him when Alan was at his most dangerous. The men realize that Denise is gone. Prade pieces together clues, all of which resemble Alan's murderous fantasy, and they fear that he has killed Denise while in a psychotic fugue state. Prade attempts to take Alan to a clinic, but they are involved in an automobile accident while on the way there. In the confusion, Alan escapes to southern France. He surreptitiously spots Denise and Prade on a yacht.

Prade has deceived Denise into taking a holiday whilst believing that Alan is under intense psychiatric care. Alan, believing that Prade and Denise have conspired against him, appears with a gun at Prade's house. Prade tells Alan that he has been in a clinic for 10 days, causing Alan to question his sanity once again. However, Denise finds an estimate for repairs to Prade's car and realizes that he slaughtered his own cat in order to stage the murder scene to deceive Alan. When she confronts Prade, he reveals his love for Denise and attempts to escape on an old gondola lift. The cable snaps and Prade is killed.

Alan and Denise are reunited, but they are solemn after their ordeal.

Prade's scheme is exposed after Denise discovers evidence of his deception. Prade is killed in a gondola accident, and Alan and Denise, though shaken, are reunited.

The ending reveals that Dr. Prade manipulated events to destabilize Alan and pursue Denise for himself, using Alan's psychological vulnerability. Prade's accidental death resolves the external threat, but Alan and Denise are left to process the trauma and mistrust cultivated by their ordeal. The film closes on a somber note, emphasizing the lingering effects of manipulation and the fragility of recovery.