From the time John J. Macreedy steps off the train in Black Rock, he feels a chill from the local residents. The town is only a speck on the map and few if any strangers ever come to the place. Macreedy himself is tight-lipped about the purpose of his trip and he finds that the hotel refuses him a room, the local garage refuses to rent him a car and the sheriff is a useless drunkard. It's apparent that the locals have something to hide but when he finally tells them that he is there to speak to a Japanese-American farmer named Kamoko, he touches a nerve so sensitive that he will spend the next 24 hours fighting for his life.

The wife of marshal Matt Morgan is raped and murdered. The killers leave behind a distinctive saddle, that Morgan recognises as belonging to his old friend Craig Belden, now cattle baron in the town of Gun Hill. Belden is sympathetic, until it transpires that one of the murderers is his own son Rick, whom he refuses to hand over. Morgan is determined to capture Rick and take him away by the 9.00 train; but he is trapped in the town alone, with Belden and all his men now looking to kill him.

Following the surrender of Geronimo, Massai, the last Apache warrior is captured and scheduled for transportation to a Florida reservation...