An ex-Marine haunted by a tragic past, Tommy Riordan returns to his hometown of Pittsburgh and enlists his father, a recovered alcoholic and his former coach, to train him for an MMA tournament awarding the biggest purse in the history of the sport. As Tommy blazes a violent path towards the title prize, his brother, Brendan, a former MMA fighter unable to make ends meet as a public school teacher, returns to the amateur ring to provide for his family.