BeckyJG: John Rain is a hero who is similar in many ways to Jack Reacher. A man of action and of few words, deep, lonely (even if he doesn't realize it). Rain is perhaps more morally ambiguous than Reacher; both kill without hesitation and little remorse, but Rain is, after all, an assassin, and gets paid to do so.… (plus d'informations)

crazybatcow: Lee Child's series starring Reacher starts with Killing Floor. If you like Rain's no-nonsense doing of whatever job it is that needs to be done, you'll probably like Child's series too.