A museum guard's girlfriend falls for a naive woman who conspires with a playboy to break them up. The woman is suspected of murder and interrogated by a psychiatrist whose mind is opened to her repressed desires.

Obsession, sex, and illusion are depicted in a series of parallel stories. Alex, a museum guard is love-struck with Nicole with whom he lives. She meets a naive Amazon, Kristina, who likewise falls desperately in love with the young woman. Kristina enlists the help of an intellectual playboy to break up the couple who by theorizing on the "love-virus and the futility of romance manages to manipulate Nicole before being mysteriously murdered. Kristina is arrested as a suspect. The Lost Door opens while Kristina is being interrogated in a psychiatric hospital where she has been committed. Catherine, a young and beautiful psychiatrist has been assigned by the court to discover what goes on in the deranged yet intriguing mind of this suspected murderer, haunted by ghosts and strange sexual situations. After a long confrontation, it's the mysterious Kristina who opens up the young psychiatrists mind to her own repressed desires.—Alain Deloffre