This time, the two mice Emily and Alexander find themselves in the far north, where they visit their cousin Makko Mackenzie Mouse, an explorer mouse who knows all the tricks of the trade. Just like cousin Makko, various human expeditions are on their way to the Arctic to discover the North Pole. Fortunately, Makko has developed a special mouse map, and when an expedition gets lost in the ice desert, the men can be rescued and put on the right track with the help of this map. Only one question remains: who will be the first to discover the North Pole?