Retired boxer Bernard “Bang Bang” Rozyski finds new purpose when he reunites with his estranged grandson and begins training him. This renewed bond helps lift Bang Bang out of a dark period in his life, but those around him remain skeptical of his true intentions. Among the doubters is an ex-girlfriend from his past, who witnessed his rapid rise to fame in the 1980s and is familiar with the intense rivalry he had with her cousin, Darnell Washington—a Detroit mayoral candidate. As Bang Bang mentors his grandson, questions arise: is he simply channeling a legacy of inherited anger, or is there genuine selflessness driving his guidance?