Detectives Kemal and Settar are on the case when a body is found in the Bosphorus.

A symbol found at the murder scene leads to a breakthrough in the investigation.

The killer sends the police a macabre clue.

The identity of the latest victim leads the detectives to a mansion in Heybeliada.

Lack of progress in the investigation leads to conflict for Kemal and Settar.

Settar pursues a dangerous lead.

A suspicious real estate deal may help crack the case.

Kemal closes in on the killer.