The Rainbow Trail, also known as The Desert Crucible, is Western author Zane Grey's sequel to Riders of the Purple Sage. The novel takes place ten years after events of Riders of the Purple Sage. The wall to Surprise Valley has broken, and Jane Withersteen is forced to choose between Lassiter's life and Fay Larkin's marriage to a Mormon.
Pearl Zane Grey (January 31, 1872 – October 23, 1939) was an American author and dentist best known for his popular adventure novels and stories associated with the Western genre in literature and the arts; he idealized the American frontier. Riders of the Purple Sage (1912) was his best-selling book. In addition to the commercial success of his printed works, his books have had second lives and continuing influence when adapted as films and television productions. His novels and short stories have been adapted into 112 films, two television episodes, and a television series, Dick Powell's Zane Grey Theater.