The outside world with its microbes and viruses is deadly for the boy Gosha. That is why he never left the hospital until the disappearance of Anya's only friend made him forget about the danger. The boy sets off on an amazing journey through New Year's Moscow, and the unlucky courier Valera, in many ways an even bigger child than Gosha himself, helps him in this. Together they will have a path that will forever change not only their lives, but also make Moscow a little kinder.