The killing kind
(Book)

A former covert operative for the U.S. Army, Michael Hendricks becomes a hitman who only kills other hitmen, until he winds up a target himself.

Michael Hendricks kills people for money. That aside, he's not so bad a guy. Once a covert operative for a false-flag unit of the US military, Hendricks was presumed dead after a mission in Afghanistan went sideways. He left behind his old life and set out on a path of redemption ... or perhaps one of willful self-destruction. Now Hendricks makes his living as a hitman entrepreneur of sorts: he only hits other hitmen. For ten times the price on your head, he'll make sure whoever's coming to kill you winds up in the ground instead. Not a bad way for a guy with his skill-set to make a living -- but a great way to make himself a target.