A former policeman Pozhivaev once notices a leaflet on a post - "A dog has disappeared ...". After a couple of meters, he stumbles upon another ad - about finding a dog. It turns out that it was about the same dog. Pozhivaev decides to help deliver the dog to the owner, who turns out to be his neighbor... So the hero comes up with the idea to create a Service for the search and rescue of pets. It includes a self-taught mechanic Vitya Burkin, an avid computer scientist Garik and Mikhalych, a young authority on the bird market...