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

Mirabelle and her family are off on holiday and Mirabelle has promised to be on her very best behaviour. She really means it too …

The holiday is amazing – but when Mirabelle makes a new friend called Beatrix, she makes a worrying discovery – Beatrix is even more mischievous than Mirabelle!

With potions gone wrong, runaway dragons and food fights, will Mirabelle’s family believe that Mirabelle is (mostly) innocent this time, or is it just a case of double the trouble?