When Zoe's sister, Rachel, ends up dead from an apparent suicide, Zoe takes it upon herself to find out the truth. Through Rachel's diary Zoe is able to follow a trail to a world of nightclubs and the secrets they hold.

Decorated homicide detective Ray Archer (Al Pacino) and his partner, criminal profiler Will Ruiney, (Karl Urban) are tasked to catch one of the city's notoriously vicious serial killers who is playing a twisted version of murder using the child's game - HANGMAN, while crime journalist Christi Davies (Brittany Snow) reports on the crime spree, shadowing the detectives.