Behzat Ç. tells about the radical changes in his life in this season. After the murder of his wife Esra, he holds Ercüment Çözer responsible. He takes a break from his profession and starts looking for Esra's killer with his civilian identity. He comes across Zeynep Fidan, who says she is in the operation and uses a fake name, Eylül. This mysterious woman who introduces herself as a narcotics commissioner tries to help Behzat. Behzat is also helped by Bahri, who works for his mother.