Obsession, sex, and illusion are depicted in a series of parallel stories. The Lost Door opens while Kristina is being interrogated in a psychiatric hospital where she has been committed. Catherine, a young 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.

Giulia is an independent young woman who is prepared to offer her body and her spirit against all the religious taboos.