The TV series "Kogot iz Mavritanii" is a Russian detective thriller about the hunt for a serial killer who preys on young women. Lera Zhukova, a student who excels academically, is an athlete and a true beauty, and she happens to be in the city when the killer strikes. Furthermore, she has a history with detective Kostya Pershin, which puts her in good standing with the police and makes her the perfect bait. However, during the operation, something goes wrong and Lera finds herself alone with the killer, who turns out to be someone she knows from her past.