In an apartment owned by Ekaterina Ryzhnova, the body of Mikhail Vershin in is found, brutally murdered. Ekaterina claims she has never seen him, and that she rented the apartment to a completely different man. Investigator Sedov has every reason to doubt her words, because at some point Katya accidentally drops a remark that Vershin in was a rare scoundrel. However, soon it turns out that the reasons to kill Vershin in were many… But besides searching for the killer, Sedov also has his personal matters to deal with: his wife ran away from him with another man—no, not just anywhere, but to Paris…