Book excerpt: When Santa ends up substitute teaching as Mr. Clausnitzer in Miss Kemper's class in North Dakota the week before Christmas, he has no idea what he's getting into! The Hooooshka triplets are big, mean boys who enjoy making life miserable for everyone, but substitute teachers are their favorite targets. The last substitute teacher they had left the school before noon crying, and the Hooooshkas figure they can break that record with this old Santa look-alike.Will Santa survive three days of substitute teaching and still have enough energy left to deliver gifts on Christmas Eve? You won't believe what happens to Santa, the Hoooshka triplets, and the rest of Miss Kemper's fourth graders!