Three volatile personalities collide at a no-holds-barred bare-knuckle cage brawl called the Donnybrook. Jarhead Earl (Jamie Bell) is determined to provide stability for his two kids and a meth-addicted wife, even if he has to punch his way to a better life. The Donnybrook’s $100,000 prize proves impossible to resist, and Earl embarks upon a dangerous odyssey to compete in the fight.

Drug-dealing Angus siblings — broken Delia (Margaret Qualley) and impossibly dangerous Chainsaw (Frank Grillo) — also have their eye on the tournament, for very different reasons. As all three collide on the road, they are tested beyond their limits in a ruthlessly honest vision of middle America where people have lost all hope.