Taylor Swift? BTS? Whose book is it?! For the moment, it's called 4C Untitled Flatiron Nonfiction Summer 2023, not the most engaging title to encourage book sales. And yet, this mystery memoir has reached the US top ten pre-order charts of both Amazon and Barnes & Noble. Fans of the singer Taylor Swift have speculated it could be her, despite no cast-iron proof of her involvement or any comments from the star herself. Something booksellers are only too keen to capitalize on. This teasing Instagram post from Skylark Bookshop says details of the memoir will be released on the 13th of June, and asks, which celebrity has an affinity for that number? Swifties will know that 13 is her lucky number. It is 544 pages long, 5 plus 4 plus 4 equals 13. It is not a political memoir, however Flatiron Books does a lot of political memoirs, including Joe Biden, Oprah Winfrey, so seems like th...