Frankie Dunn is a seasoned boxing trainer who runs a gym in Los Angeles. Burdened by past regrets and estranged from his daughter, he’s hesitant to take on new fighters. Maggie Fitzgerald, a determined and impoverished young woman, walks into his gym, asking for his tutelage. Initially rebuffed due to her age and gender, her unwavering persistence begins to wear down his resistance. Scrap-Iron Dupris, a former boxer and Frankie’s close friend who helps run the gym, sees potential in Maggie and encourages Frankie to give her a chance.

Frankie reluctantly agrees to train Maggie, and she quickly proves herself with intense dedication and raw talent. As she rises through the ranks of the female boxing circuit, an unexpected bond forms between the grizzled trainer and his inexperienced but fiercely driven student. With Frankie’s guidance, Maggie navigates the brutal world of boxing, confronting numerous personal and professional challenges. Their journey together brings forth themes of resilience, hope, and redemption as both characters strive to overcome their individual obstacles.