At 18, Diana has a chip on her shoulder; she's close to expulsion from high school for fighting, her mother is dead, her dad is surly, the popular girls at school set her teeth on edge, she knows men can cause pain. When she picks up her younger brother at a Brooklyn gym where he boxes to please his father, she decides she wants to train. Hector, a coach, reluctantly agrees to teach her. It's soon clear to him that Diana has talent; he pushes her. She spends time with another young fighter,...

Frankie Dunn has trained and managed some incredible fighters during a lifetime spent in the ring. The most important lesson he teaches his boxers is the one that rules life: above all, always protect yourself. In the wake of a painful estrangement from his daughter, Frankie has been unwilling to let himself get close to anyone for a very long time. His only friend, Scrap, an ex-boxer who looks after Frankie's gym, knows that beneath his gruff exterior is a man who has been seeking, for the past...