I've seen a few adaptations of the Richard Stark-penned series of crime novels starring heist-man, Parker.
Point Blank (great),
Payback (not so great),
Parker (really not so great). Maybe another one or two. But
The Outfit (1973) was maybe the closest to an actual Parker book in spirit and execution. I won't dwell on the differences, because they're many, but the movie does use scenes from the book in whole and in part (it's been a while since I read the early Parker books, and I think they pulled a scene or two from other Parker books, but I may be wrong).
The movie captures a lot about the world of Parker. It's a lot of backroads, hiding or waiting in cheap motel rooms, the people you try to work with are unreliable and dangerous, and the people who are the closest thing to something you'd call "friend" tend to wind up dead, in prison or both.
I really didn't know much about the movie before SimonUK brought it over Sunday morning for a view, other than that it starred Robert Duvall in the Parker role - here named "Macklin" (author Richard Stark wouldn't let films use the name "Parker" - I suppose until they made a straight adaptation). The film co-stars Karen Black and Joe Don F'ing Baker.