There's something Billy Bonkers doesn't want you to know. Come closer...I'll whisper it: he has to wear his sister's underpants! And whether Billy's flying round a go-kart track, chasing a very smelly dog, or finding some priceless long-lost treasure, it's not easy to explain: 'They're NOT MY PANTS!'

This book is part of a book series called Billy Bonkers .

This book has been graded for interest at 7-9 years.

There are 128 pages in this book. This book was published 2012 by Hachette Children's Group .

Giles Andreae is a hugely successful illustrator, the creator of Purple Ronnie and the illustrator of such brilliant books as Rumble In The Jungle and Commotion In The Ocean. Giles lives in London. Nick Sharratt was winner of the Sheffield Book Award and the Children's Book Award in 2001.