Ellie is a blind girl who comes to Milly and Molly’s class. In Ellie, it’s an experiment to see if Ellie can fit in. It takes a while for Milly and Molly to make friends with someone who is so different, but eventually they become the best of friends. But this friendship is jeopardised when Humphrey won’t let Ellie “fit in” and Ellie might have to leave the school.