You cannot trust your own memory. You can't believe other people's words. But how do you know what really happened that fateful night? On a rainy evening in New York, psychologist James Cobb gives a lecture on recovering lost memories under hypnosis. After the lecture, a stranger turns to him, who forty years ago woke up in a hotel room, found the mutilated corpse of a woman in the bathroom - and could not remember what happened the day before....