Billy's feeling nervous about his first overnight stay in hospital, as he has to have his tonsils out. The Mini Monsters are determined to help , and ask to come along too.

But there's so much for them to explore in the hospital... will they get back to Billy in time for his operation? And will anyone discover their mischief-making? Packed with colour illustrations, comic strips, maps and speech bubbles, with an action-packed plot, to appeal to even the most reluctant reader. Collect all the books in the Billy and the Mini Monsters series!1.

Billy and the Mini Monsters: Monsters in the Dark2. Billy and the Mini Monsters: Monsters go to School3. Billy and the Mini Monsters: Monsters go Swimming4.

Billy and the Mini Monsters: Monsters on a Plane5. Billy and the Mini Monsters: Monsters go to a Party6. Billy and the Mini Monsters: Monsters Move House7.

Billy and the Mini Monsters: Monsters on a School Trip8. Billy and the Mini Monsters: Monsters at the Seaside9. Billy and the Mini Monsters: Monsters at Halloween10.

Billy and the Mini Monsters: Monsters Go Camping11. Billy and the Mini Monsters: Go Green12. Billy and the Mini Monsters: Monsters at Christmas13.

Billy and the Mini Monsters: Monsters go to Hospital