The doomsday device
(Book)

Andy Stanley thinks he's seen it all as the newest--and youngest--member of the Jungle Explorers' Society. He has battled monsters, hunted down ancient magical artifacts, and narrowly escaped stampeding jungle animals. And that was after his grandfather faked his own death and revealed he's now a sentient shrunken head! But nothing can prepare Andy for what happens when the Potentate and her evil Collective of criminals steal an ancient scroll unlocking a powerful secret that could spell disaster, not just for the Jungle Explorers' Society, but for the entire world: the Doomsday Device. Once the device is activated, the countdown is on for Andy and his friends to track down the one person who can help them stop it. It's an adventure full of perilous puzzles, baffling betrayals, and vile villains. Can Andy save the world and everyone he loves--or will the Doomsday Device mean the end of our hero?