1x15 - Snowdrop

Rita's step mother confronts the detective about the fact that he is delaying the investigation unnecessarily, as it clear that the culprit is Nadya. Dectective replies that it is not possible to run a case without any concrete proof. Rita's step mother gives him 3 days' time to finish the investigation and leaves the season. Meanwhile Igor is confronted by the media about Rita's death and his relationship with Nadya is questioned as well.