The senior investigator from the prosecutor’s office for especially important cases, Muslim Safarov, urgently flew to St. Petersburg, where his fellow countryman, a young diplomat, had been killed. Posing as a diplomatic employee, Muslim began to investigate. And the first thing he found out was that the girl suspected of the murder was the biological daughter of his long-time lover. Of course, this fact doesn’t give the important investigator any moral right to excuse the suspect. But it turned out that a person’s past so strongly influences the present that sometimes it radically changes a person’s life…