A grief-stricken ex-boxer is pulled back into East Tennessee's underground fight scene when his younger brother is brutally beaten by a former rival with blood ties to his past. As old wounds are reopened, he must confront the violence, loyalty, and fractured family ties that have haunted him since tragedy tore their lives apart. Set against the working-class landscapes of Southern Appalachia, Knuckles is an intimate story of grief, brotherhood, and the difficult pursuit of redemption.