The Russian detective mini-series "Koteyka" revolves around veterinarian Ekaterina. She spends a lot of time at work after an unknown person brings her a stray cat. Ekaterina discovers that the cat has been poisoned. At first glance, there is nothing special about it: the animal accidentally ingested rat poison. However, Ekaterina is convinced that the cat used to live in a house. She decides to find the owners of the "koteyka". Soon, she learns that the animal was thrown out of an apartment by elderly women.