Amy comes up with the perfect Christmas present for Ms. Sullivan in the ninth book of the Critter Club series. It's holiday time in Santa Vista, and Amy is especially excited for Christmas. Her dad and soon-to-be stepmom and stepsister are visiting, plus, there are some adorable guinea pigs at the Critter Club. But amidst the hustle and bustle of Christmas preparations, Amy notices that Ms. Sullivan seems a little lonely. Though Ms. Sullivan assures...