A story about two very different sisters who are forced to trade places.

Dasha is in the eighth grade. She is a very ordinary girl, she has no mother, she lives with her father and younger sister Ulyana. Her father works as a car mechanic and communicates with eccentric clients, and Dasha has to take care of her sister, in which her elderly neighbor Pavel sometimes helps her. Dasha loves to dream. She imagines that she lives in a fairy tale, and the people around her are her fairy tale characters. Once, lost in her dreams and telling her sister a fairy tale at night, she imagined everything so clearly that the fairy tale "came to life": Dasha became Cinderella, and Ulyana became Thumbelina.

After a painful break up a journalist is traveling to the Elbrus mountains where he meets another woman.

In New Year's Eve in the apartment of major Vlasov and his wife warrant officer Natalya Kiselyova the phone rings. It is the General who calls and congratulates Vlasov on perfect objectives on professional development and general military training of Vlasov's subordinates. The General confirms that the major regains his grade as lieutenant-colonel and orders to come to Moscow immediately as he needs him for a very important mission. Vlasov leaves his wife and daughter Masha nicknamed Mukha in Siberia and goes to Moscow.

Lieutenant-Commander Vladimir Kozlov must find a bride and get married in a few days.