Police officer Maxim Maximov has a lot of solved crimes. At work, he is on good terms, but his personal life is not developing. Wife – criminal forecaster Elena Zharova – goes to his best friend and colleague Alexei Leonidov. The trouble does not come alone: ​​during the next case, Maximov is substituted. He stays out of work, friends, money and starts drinking. However, fate gives him a second chance – in the place of the death of his former father-in-law, he finds a wounded dog. Maximov picks up the dog and goes out, after which he gives the animal a new name – Dog. Then he quits drinking, and he and the Dog begin to solve the crimes again – now together.
Together with Maximov in the department is Igor Gnezdilov – a character who embodies stupidity and dishonesty. He is always confused and distorted by words, often in senseless situations. He works for the police thanks to his uncle, General Gnezdilov.