A mournful and vengeful old man keeps a vigil at the graveside of his son, sending a hired vagrant to assassinate those responsible for his death. After executing his son\'s killer, the hireling is sent back to bring in the other man, a black bounty hunter, who was an accomplice in the killing of Billy Dan Clanton. But the vagrant pays a black friend to impersonate the bounty hunter and tell the old man the true story of how the rotten young Billy was an outlaw and a rapist, deserving to be shot down like the mangy dog he really was.