“Both murders occurred on the same day, under the roof of the same house and at almost the same hour.” Engineer Teodosiy Dyankov was poisoned in his apartment, and junior traffic police sergeant Kirill Naumov was shot dead in the attic. There is also a main suspect - football player Vladimir Vladov, who was detained at the crime scene. At least the evidence indicating that it was he who killed Naumov is very serious, except for the murder weapon. Since engineer Dyankov worked at the Institute of Special Research under the Ministry of National Defense, state security gets down to business. And it’s clear that there’s no way to do without Major Avvakum Zakhov.