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Ten-year-old Yenny is sure that her younger brother Tim is as brilliant a detective as the famous Sherlock Holmes. There are no secrets and unsolved riddles for him.

This winter, Annie and Tim are going on holiday for the first time to a ski resort where their parents have bought a small house. Although there are ski slopes and beautiful views of the Norwegian mountains all around, Sultoppen is no ordinary resort town. During the carnival, an expensive diamond ring is stolen from a local hotel. Who is the thief in Sultoppen?