Nuptse and Lhotse are back for their third mountain expedition! After traveling to the mountains of Nepal and the peaks of the Canadian Rockies, these two adventurous cats head into the land of fire and ice: Iceland! While digging in their garden, Nuptse and Lhotse uncover an ancient Viking helmet. Excited by their discovery, the two cats make their way to Iceland to find out more about the Vikings. Throughout their epic journey, the cats learn all sorts of new things related to Iceland.