In an apartment owned by Ekaterina Ryzhova, the corpse of the brutally murdered Mikhail Vershinin is found. Catherine claims that she never saw him, and rented the apartment to a completely different man. Investigator Sedov has every reason to doubt her words, because at some point Katya accidentally drops the phrase that Vershinin was a rare scum. However, it soon turns out that many had reasons to kill Vershinin... But, in addition to searching for the killer, Sedov has to deal with personal matters - his wife ran away from him with another man, but not somewhere, but to Paris...