Thunder at Twilight is a landmark historical vision, drawing on hitherto untapped sources to illuminate two crucial years in the life of the extraordinary city of Vienna-and in the life of the twentieth century.

It was during the carnival of 1913 that a young Stalin arrived in Vienna on a mission that would launch him into the upper echelon of Russian revolutionaries, and it was here that he first collided with Trotsky. It was in Vienna that the failed artist Adolf Hitler kept daubing watercolors and spouting tirades at fellow drifters in a flophouse. Here Archduke Franz Ferdinand...