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.

Due to bad weather, gymnast Katya Prokhorova, going to international competitions, ends up in her hometown of Razlelsk and, arriving at the school where she once studied, meets a young singing teacher and falls in love with him. A few days later she leaves, and upon returning from the competition, she confesses to him that she has fallen in love with someone else. Time passes. The singing teacher ...