Everyone wants to live it up; Ivan, an engineer in a provincial factory, is no exception. He has to resort to some tricks to receive his honest pay and touch that beautiful life.

Sasha is an ordinary boy whose life is not much different from the everyday life of an average schoolboy. Sasha's parents are divorced, so they put their personal ambitions above the interests of their son. From lack of attention, Sasha begins to withdraw into himself. Everything changes when, after school, Sasha meets a new friend – a strange cleaner in a pilot's jumpsuit.

In kindergarten, a child is selected for the role of a gray mouse for a matinee. The parents of some of the children participating in the casting are directly related to art. Dad, a film director, dad, a theater director and mom, a singer, begin to prepare their children for the final viewing. Everyone has their own method of rehearsals and their own life, not devoid of problems and contradictions. A recently divorced filmmaker cannot start a new relationship with a prop girl he likes. The theater director is going through a creative crisis and is constantly striving to get home to his beloved wife and children. The self-obsessed singer is raising her daughter alone. They don't even suspect that a simple song about a gray mouse will help solve some of these problems.

The grandfather of fifth-grader Gleb Borodaev was a famous detective writer, but he died before he could finish his last horror book. A novel based on a real story - the mysterious disappearance of man called Dachnik in Borodaev's country house. Gleb and his five classmates, including amateur detective Alik Detkin, decide to uncover this secret on their own.