Mikhail is a former aircraft designer, and now just a grandfather who constantly gets into ridiculous situations. One day, on December 31, he and his grandson Seryozha took in a dog who was hiding from the New Year's fireworks. The dog was named Styopka. Soon after his grandson was taken away by his parents, Mikhail becomes ill. And now Styopka has very little time to call for help and save the life of his owner. But it is very difficult to do this, because no one knows the dog language. The only way out is to find Seryozha, who, as it seems to Styopka, understands him. And then the four-legged hero goes to the other end of the city to meet incredible adventures.
