The story is set in the late 1970s in USSR. Police are investigating a case of antiquities smuggling through the borders of the Soviet state. A prime suspect, the alleged leader of the scheme, is a star singer. To find hard evidence of the crime, policemen must enter his innermost circle without raising suspicion. To do that a popular band is created. All members of the band are actually undercover policemen. Ordinary police officers will have to become musicians and enter the glamorous world of the Soviet stage.