Prince Harry’s memoir Spare—which was leaked last week—became the U.K.’s fastest-selling nonfiction book ever on the day of its official release Tuesday, the book’s publisher said, as Harry continues his controversial press blitz to promote the tell-all that reveals intimate details about his life and the royal family.
Spare sold 400,000 copies across physical, e-book and audio formats, according to Transworld Penguin Random House, a British division of Penguin Random House.
The only books to have sold more on their first day are those concerning “the other Harry,” Transworld managing director Larry Finlay said in a statement, referring to the best-selling fiction books in the Harry Potter series.
Waterstones, the largest bookstore chain in the U.K., said that leading up to publication Spare had garnered among the most pre-orders the company had seen for a title in a decade, and on Tuesday, stores were reporting “unprecedented numbers” of customers picking up online orders, the chain’s nonfiction category manager John Cotterill told The Bookseller.
Spare has been the best-selling book on Amazon since last week.