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 eviction by the Kingpin, and her attractiveness has prompted Pomeroy to treat her more tolerantly than he has other homesteaders. But that tolerance has come to an end. Dan Grimshaw, at the risk of his own life, makes one last effort to get Melissa to give up and move on. When again she refuses, Grimshaw is confronted with a moral dilemma, one that could put him in as much jeopardy as she is.