Senior investigator of the prosecutor's office for particularly important cases, Muslim Safarov, urgently flew to St. Petersburg, where his fellow countryman, a young diplomat, was killed. Under the guise of a diplomatic worker, Muslim began to conduct an investigation. And the first thing he learned was that the girl who was suspected of murder was the daughter of his longtime lover. This circumstance, of course, does not give the important person the moral right to justify the suspect. But it turned out that a person’s past influences the present so much that sometimes it radically changes his life...