Hideous Heidi is the story of a little mouse who learns it isn't only what you think about yourself that is important, but what you do that matters. It isn't how others see us that makes us who we are, but how we perceive ourselves, and what we do with it. This is the first story in a continuing series of adventures for Heidi and Hamlin, as Heidi learns furthers lessons of what it means to be a little mouse in a big world.