"Arena for Murder" is a gripping detective series of Russian production. Polina, a gymnast who grew up in an orphanage and works in a circus, receives a large inheritance from a mysterious wealthy admirer. All her colleagues start courting the newly crowned "circus princess," including the lover of her friend Aglaya. Aglaya becomes jealous and argues with Polina, and soon the man is found murdered. Suspicion falls on Aglaya, but her friend decides to protect her. In the end, she not only discovers the truth but also finds her biological father.