Doctor Knyazev, better known by his nickname Monomakh, has an emergency. A patient dies from an unknown disease, and a few days later her mother is admitted to the clinic with similar symptoms. None of the infectious disease specialists can make a diagnosis, the tests are contradictory, but the young beauty died, and traces of the disease lead to the plastic surgery department, where she recently had breast augmentation surgery. Although these patients do not belong to his department, Monomakh still conducts his own investigation and learns that the third person related to the clinic has already fallen ill...