Jess Remsberg seeks vengeance for his murdered Comanche wife, driven to Fort Conchos for answers about her killer. He becomes involved with a small cavalry unit led by Lt. McAllister, tasked with transporting supplies through dangerous Apache territory and helping a frontierswoman, Ellen, who has abandoned her husband to return to her Apache lover, leading to a tense journey and shocking revelations about love, betrayal, and survival against hostile Apaches. Toller, a former Buffalo Soldier and skilled horse-breaker, joins the group, initially clashing with Jess but proving to be a valuable ally as the group faces relentless Apache attacks, culminating in a desperate struggle for survival.