Gather the family and make your Christmas jolly with these bestselling festive knock-knock jokes! Lift the flaps for punchlines and surprises. Follow two children on a mission to deliver a letter to Santa. Knock, knock! Who's there? Sandy. Sandy who? Sandy Claus is who we're looking for. Will they find him before he takes off in his sleigh? Take a tour of the busy workshop where elves build and wrap toys, meet the reindeer, talk to the local penguins and polar bears, and go for a sleigh ride. This popular series has sold over half a million copies and is now refreshed with vibrant new art from Steve Bjorkman.