One More Hill to Hell concerns Dan Grimshaw who rides for Caine Pomeroy. Pomeroy s Kingpin Ranch is in the process of ruthless expansion. Melissa Olmstead an attractive widow has been holding out against Kingpin s eviction notice to her. Grimshaw at the risk of his own life breaks ranks and makes one last effort to get Melissa to give in. When again she refuses Grimshaw is confronted with a moral dilemma one that could put him in as much jeopardy as she is.