The celebration of a birthday in a cheerful young company ended tragically: one of the guests was stabbed. Sergey Belyakov is suspected—he’d had fights with the victim more than once. And at the birthday party, and in general, he’d actually fought with him in front of everyone… Sergey’s father hires a well-known detective in the city, Tatyana Ivanova. It doesn’t take her long to find out that his offspring is not guilty of anything. The murderer, naturally, is someone else. But who? Ordinary investigative methods don’t help. On Tatiana’s watch, a person is shot dead in plain sight—someone clearly connected to this case. And then she “calls fire upon herself”—in the literal sense, she puts herself in the line of the killer’s shots…