Tired Ivan Tsarevich is able to turn into the Serpent Gorynych. But private detective Podushkin will not start breathing fire, even if a man named Bob Solnechnolaskovich comes to him and invites Ivan Pavlovich to advertise the Podushkin-Odeyalkin company. Before the detective had time to get rid of the annoying visitor, neighbor Irene came and asked to talk to the daughter of her friends, Katya Voikova. The girl’s father recently died; nothing suspicious was found in the death of Alexei Voikov, but Ekaterina believes that the businessman was killed. Irene asks Podushkin to conduct an investigation for the sake of appearances in order to calm her distraught daughter. Delicate Vanya could not refuse, promising Katya to find her father’s killer. And it turned out that her suspicions were not so absurd. But as soon as Podushkin finished this difficult investigation, Bob Solnechnolaskovich came again and turned all his harmonious conclusions into a pile of rubble.