Valera tries to hide her excitement before the first working day at the new school. Katya worries no less - she is absolutely not happy about the prospect of going to school, where her father teaches. However, Katya unexpectedly likes the new class. But an experienced teacher Valera has one trouble after another... However, Darina soon realizes that accidents are not accidental, someone is plotting against Valera... Meanwhile, the first client, the head teacher, comes to Darina and assures her that her little son has disappeared. However, it turns out that the woman calls her Pomeranian spitz Axel her son. Darina has never looked for animals before, but Tamara Petrovna persuades her daughter to help. Negligent schoolchildren and a spouse who is obviously hiding something fall under suspicion...