Romka, a recognized detective genius, was investigating a new case. The fearless balloonist Boris, with whom Romkin's sister Leshka and friend Venka even managed to fly through the air in a beautiful hot air balloon, is in danger. They are clearly trying to destroy him. Either Boris's heavenly sailboat almost crashed, or a tree fell on the road in front of his car. The guy crashed into a pole and ended up in the hospital. The shell does not hit the same crater twice - the detective genius rightly decided. All Friends are involved in the investigation... Evidence confirming that the accident was staged was quickly discovered. Now the main thing is to systematize them. And catch the criminal red-handed!..