Ten-year-old Lusha's father, unsuccessful writer Boris Kolechkin, works as a sales consultant for Lusha's mother Alina. She once preferred him to Sergei Amiantov, on whom the fate of her business now depends. Alina, Lusha and Boris, at Amiantov's invitation, go to his New Year's carnival. There, a duel begins between the men. Lusha helps her father as best she can. The Kolechkins have no idea that the stolen ring of the ancient Egyptian queen Nefertiti was hidden in the half-eaten hot dog that the homeless dog Caruso gave to their dog Christy. The thieves of the priceless ring organize a hunt for Christy in the absence of the owners of the Kolechkins' house. They are confronted by Caruso, who is in love with Christy and whom the family has taken in.
