Good suspense/twist&turn/romance/my… books..?

I've just finished reading The Woman in the Fifth by Douglas Kennedy. Absolutely brilliant book. Couldn't put it down. I'm looking for more books like it. It basically involves ghostly happenings and mysterious killings, romance with a woman who has been dead 25 years, superb twists and turns and a great story line of getting involved with the wrong people, working for a sinister organisations. Anything you can recommend?