This deftly made French psychological thriller terrifies with its exploration of an experiment gone horribly wrong. Dr. Marc Lacroix, a psychiatrist specializing in brain functions, is obsessed with the link between mind and spirit. To find his link he studies the criminally insane. He builds a secret machine, known only to his mistress Marianne, in which he hopes to exchange minds between humans. He simultaneously wants to help the mentally ill recover, and he wants to experience their madness. He chooses the psychotic killer, Zyto, a man who stabbed at least three women, for his experiment. The initial experiment is successful and the two exchange minds. But trouble ensues when Zyto refuses to reverse the switch. There is little Marc can do when Zyto takes over Marc's life, and more ominously his wife and child whom are unknowingly in mortal danger. Marc, encased in Zyto's body, is returned to the asylum. Will Marc's wife recognize the danger? Will Zyto kill again?
Gérard Depardieu
as Dr. Marc Lacroix
Nathalie Baye
as Marie Lacroix
Didier Bourdon
as Michel Zyto
Natalia Wörner
as Marianne
Julie Depardieu
as A nurse
Claude Berri
as Hugues
Erwan Baynaud
as Léonard Lacroix
Marc Andréoni
as Le gardien
Alain Azerot
as Un infirmier
Wilfred Benaïche
as Le patient
Christian Bujeau
as Martial
Patty Hannock
as Marie-Thérèse
