For Daniel Abend, life is comfortable. He's a successful psychotherapist living in the Upper West Side in New York City, a single father raising a teenage daughter. When one of his patients commits suicide, Daniel receives a note that has him starting to ask questions about his patient's death. Provided with a mysterious set of clues in the form of an old key, a haunting photograph and a veiled poem, Daniel is left struggling to solve the mystery before him. But suddenly, his daughter disappears.