It is a spring morning, and I am sitting with Andrew Lownie in the anteroom to his study in his Westminster town house. Around us teeter stacks of books on the royal family and a pile of Freedom of Information requests. A coffee press and two cups sit between us. At present, it’s hard to think of a more consequential British writer than Lownie.

Last year’s publication of Entitled: The Rise and Fall of the House of York, a biography-cum-assassination of the erstwhile Prince Andrew and his ex-wife, Sarah Ferguson, contained so many revelations about the couple—Andrew’s cruelty to his staff, Sarah’s money-grubbing ways, and, most damningly, their close relationship with Jeffrey Epstein—that the book made headlines around the world.