Inga Martinson, a famous ballerina, has trouble after trouble: someone is watching her car, things disappear from her house, and at the Bolshoi Theatre they decided to close the performance where she dances the leading role… And on top of all that, Inga unexpectedly learns a shocking piece of news—that she has a sister, an illegitimate daughter of her father, the famous ballet artist. If the information leaks to the press, there will be a scandal! Still, Inga decides to meet the girl—maybe they’ll even become friends… But the ballerina’s plans weren’t destined to come true: Lena is murdered. Could Inga’s family have something to do with this crime?