Slate has relationships with various online retailers. If you buy something through our links, Slate may earn an affiliate commission. We update links when possible, but note that deals can expire and all prices are subject to change. All prices were up to date at the time of publication. “As the age of handwriting comes to an end,” Joel Warner asks in his new book, “what is the value of the original texts left behind?” As it turns out, quite a bit. Warner’s The Curse of the Marquis de Sade: A Notorious Scoundrel, a Mythical Manuscript, and the Biggest Scandal...