There were four of them, student friends, and all namesakes were Dimas. Everyone lived in a scientific town near Moscow, called a “science city” in Soviet times. Two of them went into business, two remained in science. And then one of them, Dmitry Kuzmin, was killed, and in the courtyard of the house where another Dima, his boss Pilyugin, lived. And he was arrested on suspicion of murdering Kuzmin. The third friend, Mitya Khokhlov, does not believe that Pilyugin is the killer. He wants to establish the truth, despite his hardships - the theft of one hundred thousand dollars from his office, a personal drama, well, let's say not very serious, rather annoying. Another lover drove him crazy. And then their mutual friend Arina was beaten by some scumbag, allegedly because of Kuzmin’s money, who, shortly before his death, proposed to her and said that he had become terribly rich. If he was killed because of money, where did a simple scientist get it from, and who could know about it? Only someone close... And Khokhlov decided to establish who is the murderer and who is the thief?