Jessica and Elizabeth Wakefield and their friends in the Snoopers Club have uncovered their most difficult case yet! The bell that helps Santa's reindeer fly has fallen off the sleigh: If the Snoopers don't find it, Santa won't be able to deliver any presents this Christmas. They have to work fast, though, because a bad elf named Fritzi is looking for the bell, too. Will the Snoopers be able to save Christmas?