To private detective N.F. The owner of the printing house, M. Sharova, comes to Trubnikov with a request to help her find E. Novikov, who has 20% of the shares of the printing house. She wants to sell the printing house, she has already found a buyer - Yu. Degtyarev, but she needs to agree on the price of the shares with Novikov. Degtyarev is in a hurry. It was with difficulty that she persuaded him to wait until evening. Trubnikov has been friends with Novikov for a long time, so he managed to quickly find him and conveyed the request to Sharova. However, the next morning I learned that Degtyarev was killed, and the suspect in the murder, Novikov, was detained at the crime scene. The detective was even more surprised when he realized that his friend had incriminated himself and taken on someone else’s guilt. Trubnikov begins to investigate the murder of Degtyarev.