From the opening sequence in a cinema when Dr Petiot (the extraordinary Michel Serrault) seethes with indignation at the puny evil portrayed by a Nosferatu-like character on-screen and then enters the action (a la Purple Rose of Cairo), you know this is an unusual movie experience. The story is strongly based on the real Petiot, a deranged but extremely clever, even witty, physician who preyed on desperate people fleeing the Holocaust and enriched himself in the process, then escaped arrest and built a new career as a French army doctor. When, finally, the real Petiot was brought to trial, he became an instant celebrity and the event a true cause celebre. This movie was something of a labour of love for Serrault and at a time when Roberto Benigni's La Vita e Bella is causing a sensation, this sleeper should become far better known.