The 17-year-old Muscovites Olya and Sasha go to the Crimea to get
acquainted with Olya’s father Sergei. Sergei has lived all his life in a small
seaside settlement and has never seen his only daughter. On the threshold of his house, Olya gets frightened of the encounter and asks Sasha “to
swap places”. Sasha is introduced as Olya, that is the daughter, while Olya
declares herself to be the girl’s friend. First this game is amusing, but they
do not suspect that their innocent joke would turn into a drama that turns
everybody’s life upside down.