Experienced Major Bagryshev is jealous of the assignment of a young trainee Solomatin, thinking that his appearance will only bring his retirement closer. However, the first symptoms of Alzheimer's further aggravate his situation - Bagryshev understands that he will have to resign. Solomatin believes that the major is a real ace in operational search, and it is from him that he should learn in order to become a first-class policeman. Therefore, he offers his new boss to make a deal: Bagryshev will pass on all his experience and knowledge, and in exchange he will become a kind of "RAM" for him, that is, he will help him in every possible way and clean up all his mistakes. Bagryshev agrees. On the very first day of working together, the partners discover corpses in the lake. The method of murder resembles the handwriting of the maniac whom Bagryshev shot during an arrest several years ago. The major and the trainee will have to get to the bottom of this complicated case, but they do not have much time, because important "files" are erased from the experienced investigator's head.
