Istanbul cirminal underworld; a place of merciless families and swaggering hitmen afraid of no one. Kadir Korkut, nicknamed the "Demon" is the most fearsome of their kind. When he wants to retire for the love of a blind German pianist, it starts a chain of events which will paint the night red. His boss and foster father, Kara Cemal betrays and coerces Kadir by poisoning him to perform two final hits on the two largest rival families in order to receive the antidote. Outgunned, outmanned and facing impossible odds he has to team up with an outed undercover police mole Cem, and somehow survive his final night of revenge and redemption.
Kemal leads a happy life with his family. One day, Kemal gets into trouble as he witnesses a car accident. A teacher dies in the accident. The house of Kemal, who testified to the incident, is set on fire by unknown persons. In the police investigation, it is revealed that a businessman named Osman Sertoğlu had a hand in both the accident and the arson. However, Osman is released as there is not enough evidence. The only eyewitness the police have is Kemal. For this Osman tries to dissuade Kemal from testifying. To this end, he kidnaps Kemal's wife. However, Kemal has no intention of giving up his testimony.
