Once a legendary underground fighter, Shane Slavin (Gary Daniels) decides to give up his life of fighting to settle down and take care of his family. But the violent world he's stepping away from isn't ready to let him go so easily. Shane's brother, Scott (Arkie Reece), gets himself into trouble after borrowing money from a notorious gangster, Danny G (Peter Weller), and is unable to pay it back.

As a result, Shane is thrust back into the brutal world of underground fighting when Danny G forces him into a series of pitiless fights to repay his brother’s debt. Each battle drags him deeper into the savage realm, jeopardizing the safety and wellbeing of his family. Shane grimly accepts that he must use his fists to protect his loved ones and secure their future, as each fight becomes more violent and deadly than the last.