17-year-old Muscovites Olya and Sasha go to Crimea to meet Olya's father Sergei. Sergei has lived all his life in a small seaside village and has never seen his only daughter. On the threshold of his house, Olya is frightened of the upcoming meeting and asks Sasha to "change places." Sasha introduces herself as Olya, that is, her daughter, and Olya pretends to be her friend.
