Three children play games on a deserted beach.

Little Inga considers herself pretty and is pampered by her mother and other children in her housing block, until a new boy with questionable habits arrives and calls her ugly to her face.

Captain Jack, this is actually an ordinary girl, she is an informal leader among the boys, loves the sea very much and spends a lot of time on the decommissioned ship Signal. The film tells the amazing story of the Signal team, which during the war saved the lives of Soviet prisoners of war, among whom were Gunar and Mitya.