OK, the new movie from writer-director Paul Schrader isn’t for everyone, but you can drastically increase it’s watchability if you shut your eyes during the rather brief flashbacks to the main character’s Iraq War experience (trailer). We all know terrible things were done in that faraway war, and this movie is grounded by their longlasting and inter-generational effects on two American soldiers (one already a suicide).

Most of the film, starring a brilliantly low-key Oscar Isaac as William Tell (a pseudonym he’s adopted that has numerous connotations), a modest-stakes card sharp who stays in the game by never betting too much or past the point when his consistent wins might rouse casino security’s suspicions. He’s served time in federal prison and, he says, “that’s where I learned to count cards.”

Tell is a loner, traveling from casino to casino. (The film was mostly shot in Biloxi, Mississippi; casinos look pretty much the same inside.) He’s approached by two people—Cirk, pronounced Kirk, a young man (Tye Sheridan) who knows about Tell’s war experience and La Linda (Tiffany Haddish) who helps card players get financial backing for the big tournaments. At first, he turns them both down.

Cirk wants Tell’s help in assassinating one of the masterminds behind the torture of Iraqis. His target (Willem Dafoe) now runs a lucrative security consulting business. Tell refuses, seeing this quest as a good way for Cirk to ruin his life. He invites the young man to tag along with him in his travels, believing that if he can get enough money together to pay Cirk’s college loan debt and allow him to finish his education, he’ll be diverted from his current destructive path. A little life experience may help too. To acquire sufficient cash, he needs help from La Linda.

The other gamblers—dressed in the stars and stripes, wearing cowboy hats, and other distinctive garb—contrast with Tell’s shades-of-gray wardrobe. Likewise, the casinos’ garish rainbow of light is the opposite of the stark interiors of Tell’s motel rooms. He removes all the pictures and (in a Christo moment) wraps everything, even the legs of furniture, in a cocoon of white cloth. Is this a belated attempt to make things clean? Nights, Tell is too disciplined to party. He writes in his journal, attempting to explain or even expiate the past, knowing it is impossible. You get his words in voiceover, and while they aren’t memorable, they are essential. To him, and to you.

This is a movie about regret in different forms. Cirk’s regret that his father was so damaged and is lost to him and Tell’s that he can’t forgive himself. It’s also a movie about the fragility of hope—the hope the characters have for each other, and the hope all gamblers clutch to their hearts.Rotten Tomatoes critics’ rating: 85% ; audiences: 46%. (Put me in that group!)