Alan Strauss is a therapist who is held prisoner by his patient, Sam Fortner, who reveals himself to be a serial killer and wants his help to curb his homicidal urges.

To ensure his survival, Alan must tap into Sam's disturbed mind and stop him from killing again. Over the course of his imprisonment, Alan discovers not only how deep Sam's compulsion runs, but also how much work he has to do to repair the rift in his own family.

With time running out, Alan works desperately to stop Sam before he himself becomes complicit in Sam's murders - or worse, becomes a target.