When Isadora’s cousin, Mirabelle, comes to stay, Isadora is really excited. Mirabelle, who is a witch, is older than Isadora and always has the best ideas for things to do. So when she suggests that instead of taking Pink Rabbit Isadora should take a dragon to ‘Bring Your Pet to School Day’, Isadora ignores her worries and goes along with the plan. But looking after a dragon turns out to be a little bit harder than the pair of them expect . . .