Izzy's best friend in the world is Mouse. Everyone else thinks that Mouse is just an ordinary stuffed toy, but Izzy knows she's special because she can talk to her. Mouse misses Izzy when she's at school every day - she wonders why she isn't allowed to go and what school is all about. Mouse decides to find out. She goes to Izzy's school and has lots of excitement on what turns out to be a truly magical day.
