With the Kosmos Advent calendar from The Three Investigators series, you accompany detectives Justus, Peter, and Bob into the snowy Magic Mountains. Behind each of the 24 doors lies a new chapter of an exciting detective story, written by Ulf Blanck. To solve the mystery of the enigmatic snow monster, interactive puzzles must be solved daily. Only the correct solution leads to the next gimmick. A total of 24 original detective gadgets support the investigations and turn the Advent season into an interactive adventure for all young sleuths.