In the arid deserts of 1873 Arizona, a man with no memory awakens to find a mysterious shackle attached to his wrist. Suffering from amnesia, he discovers he is a wanted outlaw named Jake Lonergan. Entering the nearby town of Absolution, he quickly learns that the town is under the iron fist of the wealthy cattleman Woodrow Dolarhyde, whose son Percy terrorizes the local populace. However, Lonergan's presence and his enigmatic bracelet spark interest and fear among the townsfolk. As tensions rise, the town is suddenly attacked by strange aircraft descending from the sky—craft far more advanced than any technology known in the 19th century.

The aircraft begin abducting townspeople with lassos of light, causing panic and chaos. In the midst of the turmoil, Lonergan's shackle reveals its true nature—it's a weapon of incredible power that can fight back against the invaders. Struggling with fragments of his lost past and the reality of an extraterrestrial threat, Lonergan joins forces with Dolarhyde and other townspeople, including the enigmatic Ella Swenson. Together, they form a posse comprising of townsfolk, outlaws, and Apache warriors, to pursue the aliens and rescue their kin. As they embark on this perilous quest, they must overcome mutual distrust and learn to work together to confront a common enemy that defies their understanding of reality.