• Twelve school kids
• One evil mayor
• One mad scientist
• One forbidden dog
• A mystery afoot

Class 3C are on a school trip to London, thanks to Rubi winning an award for her science project. However, it’s not long after arriving that pieces of dinosaur skeletons start to disappear from the museum … and who better to blame than Dennis’s bone-loving companion?

Can the friends solve the mystery of the missing bones and get Gnasher off the hook before something terrible happens?

Craig Graham and Mike Stirling were both born in Kirkcaldy, Fife, in the same vintage year when Dennis became the cover star of Beano. Ever since, they've been training to becomes the Brains Behind Beano Books (which is mostly making cool stuff for kids from words and funny pictures). They've both been Beano Editors, but now Craig is Managing Editor and Mike is Editorial Director (ooh, fancy!) at Beano Studios.