The action of the Russian detective series "Orlinskaya. Neptune's Arrows" unfolds on the coast of the Black Sea in the city of Limansk. An unknown criminal brutally murders the local socialite photographer Arkady, who is loved by all and a bit of a playboy. The substantial inheritance left behind by the victim indicates that the crime was committed for money. All the threads lead to Arkady's own brother, but the police officer Marina Orlinskaya doubts this too obvious conclusion.