Jimmy Warren was so proud of his work on a hot rod, that he put his initial on it, J! The owner of the bike refused to pay the repair and maintenance work, and stabbed the young man in the chest, killing him. Reno Raines was after a young woman escaping justice, and fins a "mother courage" vowing revenge on her killer's son. So, Reno infiltrates the gang of bikers who do drug smuggling on the side, to try and find out which one of them stabbed the teenage mechanic to death. The police have almost given up on the case, but Georgia, his grieving mother, hasn't, and apart from offering a reward to anyone who may provide information leading to the murderer, she's doing her own investigation. Reno offers an oil painting of a horse and a biker to the leader of the gang he suspects, and the man lets him plant it in his office, unawares that a small microphone is relating all his conversations with the traffickers, and the trucks' dispatcher to the Sheriff's office. That leads to a great ...