McGregor, for whom motorbikes are as important as his acting career, was gazing at a map of the world when it occurred to him that it was possible to ride by bike all the way round the world (with just a smidgen of cheating around the Bering Strait), and he suggested over a meal with best friend and fellow thesp Charley Boorman, that the pair might chase their shadows from London to New York, across the Pacific to Alaska and other far-flung parts.

Needless to say, catastrophe matches the adventure at every turn, and encounters with gun-toting Ukrainians, Mongolian Nomads and (most dangerous of all) ruthless paparazzi add to the stress levels. But the 20,000 miles covered by the pair, however arduous for them, makes for a highly diverting experience for the reader. Now how do they follow this? Motorbikes are not built for lunar excursions… --Barry Forshaw