Enid Blyton 
Famous 5 on the Case: Case File 11 : The Case of the Medieval Meathead [EPUB ebook] 

A new generation Famous Five: Jo, Dylan, Allie, and Max are the children of the four kids – and not forgetting Timmy II to make up the Five!In book eleven, the Royal Treasury of Avalon Island is stolen!The Famous Five meet Scooby Doo! All the heritage of the original Famous Five – adventure, mystery, action – combined with a great modern-day feel and lots of laughs.All 24 books in the series feature black and white inside illustrations and have been adapted into an animated television series for the Disney Channel.