Sasha Larionov, is in the eighth grade and still doesn't know that his mother has left the family. Sasha's father, a decent and very honest person, was used to telling people only the truth. But here he doesn't now how to tell his son that the mother left them for another man and therefore explains her long absence from a long business trip. However, soon Sasha finds out the truth and decides to go after his mom, hoping to get her back
