Bar owner Bob uses his sister, violinist Christina, who is addicted to drugs, to transport "white poison". Taking advantage of the sympathy of the artist, a special agent of the organized crime department, police major Georgiy Ivanovich, nicknamed Titanic, is introduced into the gang of drug dealers. He gets a job as Christina's bodyguard. A penchant for improvisation unexpectedly leads him to a situation where he has to choose between duty and conscience.