Be Nice to Mice! (Katie Kazoo, Switcheroo Series #20)

Katie can’t wait for the school science fair. But when she hears that a sixth-grader named Selena is using her pet mice as part of a science experiment, Katie does her best to put a stop to it. When she turns into Selena on the day of the fair, she gets her chance to set the mice free. What a disaster! How will Katie eek her way out of this one?