The former crime boss and now successful businessman Vasily Chuprakov is brutally beaten, almost to death, by unknown assailants. This happened after Chuprakov brazenly and cruelly treated nurse Diana, who worked part-time as a dancer in a nightclub. Either trying to make amends, or feelings arose in Chuprakov’s young soul - whatever it was, he demanded that it was Diana who looked after him in the hospital. The girl agreed and immediately came to the attention of detective Lieutenant Colonel Kruchi. The policeman suspected Diana's ex-boyfriend, Marine Roman, of beating the businessman. But the situation suddenly changes radically: Chuprakov is shot. And this happens when Diana falls in love with him, and the marine Roman has a cast-iron alibi...