The Mini Monsters are causing havoc at Billy's best friend's birthday party.

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.It's Billy's best friend's birthday, and the Mini Monsters have come to the party too! Gloop gets mixed up with the jelly, Fang-Face is after the cake and Trumpet's been swept away by a balloon. Billy can't save them all on his own, but who can he turn to for help? 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!