Yes, "The Gray Man" is based on a series of novels by Mark Greaney. The books follow Six, a.k.a. Court Gentry, a freelance assassin and former CIA mercenary. There are currently 11 books in the ...

The movie, set up at Netflix by filmmaker duo Anthony and Joe Russo, is based on Mark Greaney's 2009 novel of the same name and revolves around freelance assassin ... "The Gray Man" will also ...