Mistress of the Monarchy, by Alison Weir. Since I love Weir's biographies and other works of nonfiction, I'm especially looking forward to this biography of Katherine Swynford.
The Seance, by Jonathan Harwood. Victorian ghost story. Harwood is also the author of The Ghost Writer.
The Widow Cliquot, by Tilar Mazzeo. ARC coming to me in the mail; nonfiction about the woman who created the Cliiquot champagne empire.