Katya and Tomka happened to observe an interesting picture when they were relaxing on a country beach. Horses were walking along the river bank. In front was a red one, followed by a dappled gray one, next to her was a black foal, and at the end of the procession was a handsome horse with a white mane. It’s strange why the horses are alone: they went on a journey, ran away from their owners? The girls wanted to find out what kind of horse company this was. In addition, a conversation accidentally overheard in the tower of an unfinished house suggested that a crime was being planned, also related to horses. The friends took up the investigation. And on time. After all, if it weren’t for them, there would be trouble!..