Another laugh-out-loud monster adventure in the Billy and the Mini Monsters chapter book series, perfect for newly independent readers aged 6+ and fans of Claude and Horrid Henry. 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.