The micekings have received a mysterious letter, and smarty-mouse Geronimo Stiltonord is the only one who can read it! Unfortunately, he still can't understand it-but he knows it's a message from the Oofa Oofas, the laziest rodents in the ancient far north. The micekings decide to pay them a visit, in case the message is asking for help...and drag Geronimo along for the adventure!