He's tackled all sorts of missions - exploding conkers, zombie sweet-shop owners, and man-eating giant slugs - with a bit of help from his best friends and sidekicks, Colin and Harry (as long as it's not past their bedtime). Then Jack notices something strange and suspicious about the hairdresser in town, Valentino.

Binding: Paperback;304 pages; Publisher: Penguin Random House Children's UK; Classification: Children?s / Teenage fiction and true stories; Weight: 260 g; Dimensions: 131 x 176 x 19

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