"Thriller" Novels I would recommend
To differentiate between Suspense novels and Thillers I have basically made a decision based on the level of gore and realism. Thus, a primarily political story to me is probably going to be suspense while a story with a lot of sex and blood is going to be a Thriller. Like most categorizations, this is a judgment call.
See also: Suspense Novels I would recommend.
The First Law
by John Lescroart
NOTE: This book should probably be under Suspense but it is a bit more violent than nomal.