The film follows William Tell (Oscar Isaac), a gambler and former serviceman who sets out to reform a young man seeking revenge on a mutual enemy from their past. His spartan existence on the casino trail is shattered when he is approached by Cirk, a vulnerable and angry young man seeking help to execute his plan for revenge on a retired military major. Gaining backing from mysterious gambling financier La Linda, Tell takes Cirk with him on the road, going from casino to casino until the unlikely trio set their sights on winning the World Series of Poker in Las Vegas. But keeping Cirk on the straight-and-narrow proves impossible, dragging Tell back into the darkness of his past.