Riders of the Purple Sage (1918 film)

Riders of the Purple Sage is a 1918 American silent western film directed by Frank Lloyd and starring William Farnum, Mary Mersch, and William Scott. Based on the 1912 novel Riders of the Purple Sage by Zane Grey, the film is about a former Texas Ranger who goes after a group of Mormons who have abducted his married sister. This Frank Lloyd silent film was the first of five film adaptations of the novel.

While Venters is out searching for the rustlers who have been raiding the Withersteens ranch and stealing their cattle, he wounds and captures the rustlers masked leader, who turns out to be a beautiful young woman Katherine Adams. Rather than turning her over to the law, Venters brings her to a secluded valley, where the two fall in love.Meanwhile, Lassiter learns that his sister is dead, and that the man who abducted her, Dyer Marc Robbins, is also responsible for much of the trouble faced by Jane and her family. Lassiter tracks the villain and raids a Mormon meeting, killing Dyer. The angry Mormons then pursue Lassiter, Jane, and Fay to the secluded valley where they meet Venters and the repentant cattle thief, whom Lassiter recognizes as his dead sisters daughter, Millie. Venters and the girl escape the Mormons, but Lassiter, in rolling a huge boulder down on his pursuers, blocks the only exit to the valley, trapping himself, Jane, and Fay inside the valley forever. ........

Source: Wikipedia