Ten-year-old Čurkstiņš is both an ordinary and unusual modern boy who, in his wanderings around the outskirts of his town, is never far from his two passions: his camera and his white cat, Watson. Čurkstiņš has a rich library of detective novels at home. The books he has read clearly influence his perception of the world around him, but the boy also possesses enormous patience and a sense of honesty. All of this suggests that he has the potential to be a talented investigator. During the course of the film, the boy, without realizing it, has done his first investigative work, exposing the cunning money-grabbing and hiding mechanisms of the fisherman Mellup. Čurkstiņš has evidence that the police officers lack. Gathering this evidence, of course, involves difficulties, risks, and clever solutions, which also form the plot of the film, but it all began with the lies of adults, against which the little boy protests internally and begins his great work.