Some stones are better left unturned.

When close-to-retirement homicide detective Settar Öztürk is assigned a final case with his case partner Kemal McAllister, they discover a series of ruthless and operose murders. They soon discover they are dealing with a serial killer whose motives are connected with Islamic heresy and sufism. As the case disentangles, the detectives find out solving the case is not their only role in this picture.