These are two of the best books I've read in a LONG while.
True Evil is about an FBI agent whose sister tells her that her husband murdered her..as she lay in her hospital bed after a stroke. It turns out rich people are hiring someone to give their spouses cancer so they don't have to get a divorce.
Blood Memory is about another FBI agent who suddenly starts remembering some horrible experiences of her past. I can't say too much about it without giving a lot away, but it's an AMAZING book.
I've also read Sleep No More by the same author, but it's not as good. But it was still worth the read.