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? Join Billy and the Mini Monsters in this laugh-out-loud adventure series for young readers, with colourful illustrations throughout.
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