Sergey, a businessman from Barnaul, comes to Mexico on vacation with his adult daughter Dasha. At the hotel, Dasha meets a girl of the same age, Anya, who came on vacation with her father, Mikhail, a professor of geology. The girls want to have fun, and they go to a nightclub, from where they do not return. At night, a dead Mexican guy is found on the seashore, with whom Dasha and Anya were last seen. After a short investigation, the police announce that the girls also drowned. At the same time,...