Katie the Cat-Sitter by Colleen AF Venable & Stephanie Yue
All of Katie's friends are going to a camp and her mom says she will have to pay the camp herself. She tries out many jobs, but they don't work. She gets hired to watch 217 cats. She finds out the owner is a superhero/bad guy. The owner is put in a trap and Katie has to get her out with her cats.
