Isadora Moon Gets the Magic Pox

"Isadora Moon is special because she's different. Her mum is a fairy, her dad is a vampire, and she's a bit of both. Isadora has got a maths test on Monday, and she's worried she's not going to do very well. If only she was ill she could get out of doing the test? But giving yourself magic pox is never a good idea, and soon everything is out of control. Can Isadora make it all better?"--Publisher's description.