Bit of a mind-boggler this. It describes situations where the outcome of a war or even a single battle could have changed the world. The first one is a good 'un, involving what would have happened if Sennacherib, king of Assyria, had conquered Jerusalem. Not by himself, obviously. At the time, the Assyrians were quite 'ard. They took on a coalition of Egyptian, Philistine, Phoenician and Jewish forces and pummeled fook out of them. Judah, at the time, was small and weak, and Jerusalem looked like it was going to get its head kicked in. But the Assyrian army was struck down with disease (the Bible reckons 185,000 dead, which is certainly a massive exaggeration, think of it as Biblese for "We don't know how many of them there were, but there was a fooking lot.") and of course the Jews went "God did it!" proving that their God was harder than everybody else's, ergo they were harder than anybody else. But if Sennacherib (and his army) had succeeded, there would be no Jewish faith (because their "KO by disease" cemented their faith that there was only one God), and hence no offshoots from the Jewish faith, so no Christianity or Islam either. So society would be totally different, with no (or at least very different) religious influences affecting us, our history, and our daily lives today. The book goes through the ages, what would have happened if Charles Martel hadn't knacked the invading Muslims at Poitiers in 732, what if the Khan hadn't died and the Mongols had continued on into Western Europe in 1242, England getting invaded by the Spaniards in 1588, and other more obvious ones like what if Hitler had invaded the eastern Med instead of Russia in 1942, what if the Yanks had got a thumping at Midway, etc. I freely admit to not fully grasping all the consequences of these what ifs? but just cogitating about the ones I can understand hurts my head. I have to bugger off after every chapter and have a think. What makes this book different to other "But what if Hitler had two bollocks?" is just how possible some of these possibilities are. Some of them seem fairly likely, in fact. Good material for the procelain throne.