The TV series "Oper on Call" is a detective story about true love and revenge. Operative Artem Trofimov tragically loses his beloved woman. He cannot forgive her death, neither himself nor the mysterious killers, so he starts working in the Criminal Intelligence Department. Now he is not just a regular policeman, but an undercover special agent. To everyone he knows, he is just an ordinary employee of the Police Museum, but in reality, he solves complex criminal puzzles and prevents murders.