Two days ago I started reading a book called "Heart Sick" by Chelsea Cain, which was reviewed somewhere a month or so ago, and is now lurking at the bottom of the NYT bestsellers fiction.
It's a mystery, something I usually don't read, the story of a police detective kidnapped by a female serial killer and tortured almost to death (this part is told in flashback). The tec and the narrator, a newspaper writer who narrates the current part, are tracking another and different serial killer.
The description of the detective's submission to the torture by the serial killer and their subsequent relationship is breathtaking, and is one of the best d/s relationship descriptions that I've ever read. A must read.