Two New Thrillers: Relentless, Mark Greaney and Dark Horse, Gregg Hurwitz Two New Thrillers: Relentless, Mark Greaney and Dark Horse, Gregg Hurwitz For years I have been under the spell of certain thriller writers. David Baldacci is one. Two others are Mark Greaney and Gregg Hurwitz. Any time they publish a new book I […]