On the night Duke Kilroy becomes world heavyweight champion, a brutal assault leaves his brother dead, causing him to snap, resulting in him being sent to a U.S. prison for eight years.

Upon his release, Duke returns home seeking vengeance against the man he believes set him up — the criminal kingpin and former promoter, Kingsley Marshall. But Kingsley has vanished, leaving his children and wife, who happens to be the love of Duke’s life, to pick up the pieces.

Working with a cartel desperate to control London's drug market, Duke begins to infiltrate Kingsley's empire in order to destroy it from within. But amidst a volatile criminal landscape and competing influences threatening to pull him off course, Duke must channel everything that made him a champion fighter into his bloody pursuit to win the ultimate victory – revenge for his brother.