Karen and Andrew are asked to find an angel for the Christmas tree and choose one that costs more money than they expected. When the angel breaks, they have no angel and no money and must try to find a replacement in time for Christmas.
Karen and Andrew love the movie Space Game and want the movie toys. Mommy does not approve of toy guns and will not let them have any. Then Karen comes up with a plan.
Karen starts the Kittycat Club with Amanda and Hannie, planning to cat-sit for people just like Kristy and her Baby-sitters Club babysit for children, but no one wants a cat-sitter.
When Karen moves to Chicago for six months with her mother and stepfather, she finds it difficult to leave her father and her stepfamily in Stoneybrook.
Karen did not mean to cheat, she just was not ready for the surprise math quiz. When her teacher and her friend Hannie ask her if she cheated, she lies.
During a family vacation in the Caribbean, Karen enjoys exploring caves, snorkeling, and hunting for seashells but is confused when her new friend Sandy refuses to swim with her.
Karen's class is having a secret Valentine exchange and she picks her enemy Pamela, but she decides to be nice anyway. Pamela starts receiving mean notes that Karen did not write and other mix-ups start happening. Karen and her friends try to discover who has been messing up the Valentine's fun.
