A man, nameless, wakes up in Manhattan in a stranger's apartment with few memories of who he is. He remembers a life in California and the love of a girl named Sarah—memories that don’t match the life he now finds himself in.

Losing hold of what he can say for certain about his life, he turns to a doctor who claims he can help recover more memories through hypnotic regression. But when the sessions start to blur the line between what has happened in his past and what merely could have happened, and memories of the past start to occur in the present, his journey to find his past becomes a fight to stay himself and retain his future.