Robert Ludlum has some decent ones. the Bourne series, Prometheus deception, Matarese Countdown. Robin Cook for medical thrillers. Coma is my all time favorite. Try getting your hands on Dennis Lehane's Shutter Island if possible. you'll love it specially if you haven't seen the movie.
if you like fantasy/mythology - then Game of Thrones.
Any sidney sheldon books are good I just completed fredrick forsyth's The negotiator some two days back. worth the read.I would suggest just go to your local library and pick up any random book according to your genre
Agatha Christie , Erle Stanley Gardener , Doyle books are good. I have liked John Grisham books as well.
Agatha Christie seems like an old lady infront of sherlock (i have her novel -a caribbean mystery- in front of me as we speak ..err type)
John Grishams books are also nice but he talks a lot abt law
And Robin cook has too much medical stuff in his novels