Mathematics textbook for the 5th grade. According to the conditions of the problem, every day a Pedestrian goes from point "A" to point "B", on the way he meets a Cyclist. Then he returns home, where his faithful wife is waiting for him. The next day everything repeats. But one day the Investigator stops the Pedestrian and reports that the Cyclist has disappeared. The Investigator asks the Pedestrian to go with him to point "B" in order to interrogate witnesses and figure out this complicated story together.

Mila has taken the puppy of her friend, who has developed an allergy. Her friend talked about it to her teacher, who shared the story with her husband, who discussed it with his trainer, etc. But each time as the story gets told, the meaning changes and soon in the social networks appears a post that Mila is prostituting herself. This story is about the speedy transformation of harmless news into a gossip which literally destroys the life of the heroine.

Two couples meet in the cafe. A delicate and frank topic that has opened up provokes a quarrel “couple for couple” and within each couple at the same time. It all ends with an attempt to save the evening, save friendship, save relationships. How? It looks like the answer was already known at the beginning of the evening.