If I could only choose one - it would have to be Dean Koontz. I think I have every book he's ever written. I also own all of Stephen Kings books, lots of John Saul, Anne Rice, and Brian Lumley for all the scarey stuff. On the lighter side I love Anne McCaffrey (books about a world that humans have inhabited - and engineered talking dolphins and dragons that fight 'thread' - a parasite that comes from the sky) - and Jean Auel (Pre-historic novels - Clan of the Cave Bear).
My hubby hates when I read - I tune everything else out and he can be hollering at me for ten minutes before I finally go - huh, did you say something?
Obviously he's not a reader, unless it's Penthouse!