The head of a gangster group seriously fears for his life. For some time now, horrifying events have been happening in his office - his secretary was killed, a valuable floppy disk was stolen. Most likely, this is due to the transportation of a mysterious cargo. The boss hires private detective Tatyana Ivanova, hoping that she will identify the killer. There are six people under suspicion, and the threat clearly comes from one of their own.

Tatyana builds versions, but they all collapse: someone is methodically shooting down candidate criminals. Tatyana is at a loss, the boss of the bandits is in a panic, and there are fewer and fewer suspects...