The hungry gun is a .30 caliber Spencer rifle repeater—the deadliest gun in the West. Its owner is Jubal Cade. A trained doctor, his mission in life is no longer to treat the sick but to track down the scar-faced murderer of his wife. And to kill him.
Cade rides a train populated by an all-female entertainment troupe. He discovers that there's a slim chance that one has a clue to his wife's killer. Before he can learn anything, the train is robbed by Mexican bandits and the women captured. If he wants that information Cade has no choice but to rescue them.
But there are other guns greedy for death and Jubal must risk his own life in a cross-fire of violence not of his making.
Will the hungry gun and the man behind it taste the sweetness of revenge?