The Nowhere Man by Gregg Hurwitz
Evan Smoak, aka Orphan X, is a former member of an elite warrior group, created and trained in the shadows with complete deniability and absolute secrecy. He’s now retired and serving as a Good Samaritan, passing along his secret phone number to struggling victims who he’s determined to help.
When they call, he answers with this simple question:
“Do you need my help?”
Warner Bros. is negotiating to buy the movie rights to Orphan X to be played by Bradley Cooper.
I also like Hurwitz’s now abandoned series about Tim Rackley, the Deputy U.S Marshall and elite manhunter. He’s reportedly working with TNT to develop a TV series based on the Rackley books, but nothing is out yet. If you want to try the Tim Rackley series, which I highly recommend, start with Kill Clause, the first book in the 4 book series.