Evgeny Korolev arrives in Moscow by train and meets his future friend there - a red-haired first-year student Vladimir Vladimirovich Kvakusha. In addition to this guy with a funny last name, Zhenya recognizes Sasha, the head of the first-year students, who falls in love with him without memory. However, Zhenya himself falls in love with a third-year student, Veronika, whose boyfriend, Anton Sedykh, has great ties with the deputy dean Pavel Ilyich Gusev. As for Gusev, he hates Dean Vesnovsky and wants to take his place with all his might. Gusev's behavior affected not only teachers and students, but also Evgenia: he was once expelled from the student dormitory. However, he remembers that he has a friend Kvakusha, who is always ready to help him: the whole problem is that Kvakusha is a master at creating problems, and it is very difficult to solve them later.

Captain Emelin, nicknamed Emelya, Captain Vasin and Dolbunov are investigating the most complicated crimes, and criminologist Masha Likhacheva helps them in this. Emelya's reputation is so-so, the head of the department, Colonel Khitruk, dislikes him for his independent character, but has to put up with him because Emelya has a good disclosure.

Nobody knows what can happen with each of us tomorrow at dawn. Three our heroes woke up on a desert island in the company of two beautiful... but not very friendly girls... with no water and food... This was where they started to realize that life is really full of surprises!