Mary-Kate & Ashley are spending the weekend at the 'coolest' resort ever -- The Icy Igloo Inn. It's a hotel made completely of ice -- ice walls, ice furniture, ice dishes and more. But the action really heats up when things start to melt. Someone must be behind these strange-goings on -- the temperatures are way too cold inside and out for things to just dissolve. Lucky for the guests and hotel owners, the Trenchcoat Twins are on the case!