Anna Sayanova, a surgeon with many years of experience, mother of three adult children, is getting ready to celebrate her birthday. But suddenly it turns out: her former student Anatoly Krechet ended up in the traumatology department. Someone beat the guy half to death. Dealing with the circumstances of the case, Anna learns that Anatoly is part of a group of people whose relatives have suffered from a new drug for acute leukemia called Goludrol, produced by a company whose CEO is a certain Ilya Mitrokhin. Some time later, Mitrokhin is killed in his own office, and Anatoly becomes the prime suspect...