Five Go Off In A Caravan is the fifth book in the Famous Five series by the British author, Enid Blyton. In this part all five (Julian, Dick, George, Anne and Timmy) meet a new friend called Nobby and his chimpanzee "Pongo". There's a secret under the ground where the Five have their caravans and the secret is of Nobby's uncle Tiger Dan and his friend Lou. They have had troubles with Tiger Dan and Lou.