Fred and her math-teacher mom are always on the move, and Fred is getting sick of it. She's about to have yet another birthday in a new place without friends. On the eve of turning thirteen, Fred sees something strange in the living room: her mother, dressed for a party, standing in front of an enormous paper lantern--which she steps into and disappears. Fred follows her and finds herself in the Land of Impossibility--a loopily illogical place where time is outlawed, words carry dire consequences, and her unlikely allies are a depressed white elephant and a pugnacious mongoose mother of seventeen. With her new friends, Fred sets off in search of her mom, braving dungeons, Insult Fish, Fearsome Ferlings, and a mad Rat Queen. To succeed, the trio must find the solution to an ageless riddle.