Evgeniy Okhotnikov's professional bodyguard receives an unusual task - to accompany a boy violinist to school. On the second day of her work there, the fire alarm goes off, there is a commotion, and her ward finds himself locked in the music room alone. When Zhenya breaks down the door to save him, she discovers... that there is no one in the class. To restore her reputation, Okhotnikova needs to find the boy and understand who could have kidnapped him and how...