In the summer of 1914 most of Europe plunged into a war so catastrophic that it unhinged the continent's politics and beliefs in a way that took generations to recover from. The disaster terrified its survivors, shocked that a civilization that had blandly assumed itself to be a model for the rest of the world had collapsed into a chaotic savagery beyond any comparison. In 1939 Europeans would initiate a second conflict that managed to be even worse - a war in which the killing of civilians w...

One of the great historians of our age asks: how far can a single leader alter the course of history?

The modern era saw the emergence of individuals who had command over a terrifying array of instruments of control, persuasion and death. Whole societies were re-shaped and wars fought, often with a merciless contempt for the most basic norms. At the summit of these societies were leaders whose personalities had somehow given them the ability to do whatever they wished.

Ian Kershaw's new book ...