It all started with a terrible incident. The car explosion nearly killed Roman and Leshka's friend, Andrei, a reporter for the Novosti Plus newspaper. The next day, the brother and sister come to visit their miraculously saved friend and find out that on that ill-fated morning the journalist made an appointment with a large businessman to interview him. The young detectives are itching to take on this case - alas, Romka has to pass exams, and Leshka is going to Voronezh to visit his friend Katka. But by chance, it was in Voronezh that Leshka gets on the trail of the criminal who committed this attempt and was preparing another...