I really enjoy the following authors:
David Baldacci -
http://www.fictiondb.com/author/davi...list~17571.htm (especially the King/Maxwell series)
Nelson Demille -
http://www.goodreads.com/series/52228-john-corey (love all his books, especially Gold Coast and the John Corey series linked above).
Steve Martini -
http://stevemartini.com/books/trader_of_secrets
You must have read Dan Brown's books - DaVinci Code, Lost Symbol, and Angels and Demons?