Josh, Emma and Libby Binkerton return to the Good Times Travel Agency --- but this time, with a plan to travel to the future, to the next Olympic Games. What could go wrong? Well, plenty! Like when the owner of the shop misunderstands and sends the children to the ancient Olympic Games instead --- in fifth-century BCE Greece! The Binkertons try to make the best of things. But after discovering some eye-opening facts about the ancient Games, causing a pile-up at the chariot races and having to run for their lives to escape the upset locals, the trio find themselves perilously close to disaster aboard a warship! Can the children finish reading the guidebook that will transport them back to the present before it's too late?