Hollywood filmed three of Grey's novels in 1918: Riders of the Purple Sage, The Rainbow Trail, and The Border Legion. Since then, a total of 113 movies have been adapted from his books; in some instances, one title has produced four or five movies. Grey's early movies were silent films, and it was on these that he worked closely with the producer and director. He was especially concerned that the movie be shot on the location described in the novel and that the result be true to the spirit of the novel. Grey even moved to Hollywood and headed his own film company for a short time.