In Five Go Off in a Caravan, the Famous Five — Julian, Dick, Anne, George, and Timmy the dog — set off on a holiday in their horse-drawn caravan. While en route, they come across a struggling circus troupe and decide to join them for a bit. But soon they discover that some members of the circus are hiding darker intentions than just performing acts. When strange noises, secret meetings, and suspicious characters emerge, the Five must use their wits and courage to uncover the mystery before danger overtakes them