Randall Hansen is a historian who lives in Canada and who wrote The Fire and the Fury: The Allied Bombing of Germany, 1942-1945 in 2009. People had been buying it here and there over the years; after all, it’s not as if WWII goes out of style. Then he checked after Michael Wolff’s book about the president of the United States came out. “And saw that I had moved from very, very low sales onto three best-seller lists,” Hansen says.