Hitler was such an anomalous character - he was so over-the-top chaotic in his approach to statesmanship, his manner and in the violence which overwhelmed the country initially. I think diplomats around the world... felt like something like that simply would not be tolerated by the people of Germany.

Whenever I finish a book, I start with a blank slate and never have ideas lined up.

To me, writing is a very physical process. I lay out the entire book with the two narratives side by side on my bedroom floor, and just get down on my hands and knees and start looking at it in that physical space. "Does this really follow from this? Should this be here or elsewhere?" I will literally cut the paper into paragraphs. I'll cut it into segments and move the segments around from one narrative to the other until I feel that I've found the natural structure.

Beneath the gore and smoke and loam, this book is about the evanescence of life, and why some men choose to fill their brief allotment of time engaging the impossible, others in the manufacture of sorrow. In the end it is a story of the ineluctable conflict between good and evil, daylight and darkness, the White City and the Black.

I started reading the big histories and the small histories, the memoirs and so forth. At some point, I found the diary of William E. Dodd.

Dodd continued to hope that the murders would so outrage the German public that the regime would fall, but as the days passed he saw no evidence of any such outpouring of anger.

Beneath the stars the lake lay dark and sombre," Stead wrote, "but on its shores gleamed and glowed in golden radiance the ivory city, beautiful as a poet's dream, silent as a city of the dead.