Can it really be true that there's an ancient curse on the town of Lamonic Bibber? And you guessed it, that old roo-de-lally Mr Gum and his trusty sidekick Billy William the Third have something to do with it. But ... our favourite heroes Polly and Friday and the gingerbread biscuit Alan Taylor (only 15.24 cm tall) are determined to save the town (sigh of relief).

Mr Gum and the Power Crystals is the fourth book in the internationally best-selling series by Andy Stanton, which has won everything from the Blue Peter Book Award (twice) to the Roald Dahl Funny Prize and the Red House Children's Book Award.

Don't miss Mr Gum's other villainously brilliant adventures...

You're a Bad Man, Mr Gum!

Mr Gum and the Biscuit Billionaire

Mr Gum and the Goblins

Mr Gum and the Power Crystals

Mr Gum and the Dancing Bear

What's for Dinner, Mr Gum?

Mr Gum and the Cherry Tree

Mr Gum and the Secret Hideout

Andy Stanton studied English at Oxford but they kicked him out. Before becoming a children's writer he was a film script reader, a market researcher, an NHS lackey, a part-time sparrow and a grape. He is best known for the hilarious, bestselling and award-winning Mr Gum series and has also written picture books, including Danny McGee Drinks the Sea. Andy lives in North London and likes cartoons, books and music (even jazz).

David Tazzyman studied illustration at Manchester Metropolitan University. As well as illustrating the Mr Gum series, he has illustrated many picture books including Eleanor's Eyebrows, You Can't Take an Elephant on the Bus, Michael Rosen's Jelly Boots, Smelly Boots and My Mum's Growing Down by Laura Dockrill. He lives in Leicester with his wife and three sons.