Enid Blyton 
Case File 19: The Case of the Gobbling Goop [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 nineteen, an eccentric professor disappears – with a secret formula!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.