More of the world's leading historians, including Geoffrey Parker, Theodore K. Rabb, Cecilia Holland and Caleb Carr, postulate on what might so easily have been. Concentrating on the crucial and the seemingly insignificant, this volume is a provocative look at the way our world could easily have been. What if William hadn't conquered? What if the Enigma code remained uncracked? And would this even matter if Lord Halifax had become Prime Minister rather than Churchill?