Circle: Eyes of Darkness

University research assistant Prof. Dr. Sinan Demirhan is attacked at home with his family. There are coded messages written in blood at the crime scene. While his wife and daughter died, the professor, who survived the attack with serious injuries, is put to sleep in the intensive care unit. While trying to decipher the codes with the help of a cryptology expert from Tübitak, the special unit cops find themselves in the middle of an incredible conspiracy when they learn that the professor is working on a vehicle prototype that runs on his own energy. Who attacked the professor and his family and why? Was the attack orchestrated to steal the prototype the professor had developed? Are there foreign agents in your business? While Zeynep and Hakan are trying to solve this mysterious case, the investigation gets even more interesting when an extraordinary chief is assigned to the special unit.