Half witch, half fairy, totally naughty! Mirabelle is Isadora Moon's cousin, whom we first meet in the author's famous Isadora Moon series.

Mirabelle and her class are going on a school trip to a magical-creature sanctuary, and Mirabelle can't wait! Even being partnered with annoying goody-two-shoes Lavinia can't ruin her day.

But when she accidentally lets the bittens (part bat, part kitten, totally adorable, slightly fierce) out of their enclosure, their day becomes a bit more complicated.

Can Lavinia help Mirabelle stay out of trouble? And can Mirabelle show Lavinia that maybe some things are worth getting in trouble for....