Mark for Blood: Mason Dixon Thrillers, Book 1 (Unabridged‪)‬

All Mason Dixon wants is to mix classy drinks for classy people... Mason owns a bar, and he's not getting any younger. He wants nothing more than to retire in peace, fishing and drinking with the locals. But his past as an assassin is catching up with him. Mason moonlights as an assassin, taking jobs to remove "marks" from the playing field. It pays well, and he's good at it. So when he makes a mistake, things quickly get out of hand and he finds himself racing against the clock to save a life he inadvertently put into danger.