In 1950s New York, Lionel, a private detective with Tourette syndrome, sets out to uncover the mystery behind his mentor and only friend Frank's murder. Scouring the jazz clubs and slums of Brooklyn, he soon uncovers a web of secrets.
A boy kills a man and accuses his twin brother of the murder, and the innocent brother ends up institutionalized, while his psychotic twin goes free. 10 years later, the innocent twin escapes, which triggers his brother into killing again.