David O'Connell is a writer and illustrator from South London. He works mostly in children's books (particularly humorous picture books and young fiction), writing for other illustrators or illustrating for other writers! He likes stories about magic and monsters, especially if they're silly monsters, and loves making comics too. His favourite sweets are fizzy cola bottles.

Claire Powell is an illustrator and designer based in London. She has worked with a number of major TV and film brands including Nickelodeon, CBBC and DreamWorks. Her short animation, The Scapegoat, won best short at the British Animation Film Festival in 2015.

When a batch of his experimental sweets goes wrong at the McBudge Confectionery Company, Archie needs a distraction. And when he hears about a book of magical wisdom lost in a tunnel beneath the mountains, Archie is determined to find it. It's DEFINITELY so he can be the best magical guardian of Dundoodle that he can be and DEFINITELY NOT so he can turn tree branches into flying surfboards. Only trouble is, the key to open the tunnel was broken into four pieces hundreds of years ago and hidden.

Archie, Fliss and Billy set out to find the pieces of the key, but why was the tunnel sealed off in the first place? And what is the deep, sinister, MOUNTAINOUS voice Archie keeps hearing on the wind?

David O'Connell, author of The Chocolate Factory Ghost, returns with the latest adventure in his madcap magical mystery series for anyone who loves monsters, puzzles and SWEETS.

If you put your copy of Harry Potter and Charlie and the Chocolate Factory in the washing machine together, this would be the book that came out at the end. Don't put books in the washing machine though.

Humour pervades every page, with jokes appearing at the perfect place and with fabulous timing

A thoroughly satisfying and entertaining story, a mix of adventure, comedy and magic ... Delicious!