Tired Ivan Tsarevich is able to turn into a Snake Gorynych. But the private detective Podushkin will not start breathing fire even if a man named Bob Solnechnolaskovich comes to him and offers Ivan Pavlovich to advertise the company ' Podushkin-Podyalyalkin'. The detective did not have time to get rid of the annoying visitor, as a 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 Alexey Voikov, but Ekaterina believes that the businessman was killed. Irene asks Podushkin for the sake of appearance to conduct an investigation to calm her distraught daughter. The 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 most difficult investigation, Bob Solnechnolaskovich came back and turned all his slender conclusions into a pile of rubble.