"The Rainbow Trail: A Romance" is a novel written by Zane Grey, published in 1915. It is a sequel to Grey's earlier novel "Riders of the Purple Sage," although it can also be read as a standalone work. Set in the American West, "The Rainbow Trail" continues the story of the characters introduced in "Riders of the Purple Sage." The novel follows the adventures of John Shefford, a young clergyman from Illinois who travels to the remote Mormon settlement of Surprise Valley in Utah in search of his lost sister. Along the way, Shefford encounters a cast of colorful characters, including the enigmatic Venters, the spirited Fay Larkin, and the fierce outlaw known as Lassiter. As Shefford delves deeper into the mysteries of Surprise Valley and its inhabitants, he becomes embroiled in a conflict between the Mormon settlers and a group of rustlers led by the notorious Dyer. Alongside his newfound allies, Shefford must confront his own doubts and fears while navigating the dangers of the frontier. "The Rainbow Trail" is typical of Zane Grey's works, which often feature themes of adventure, romance, and the rugged landscapes of the American West. The novel showcases Grey's skill in creating vivid descriptions of the natural environment and his ability to craft compelling characters and plots. It remains a beloved work among fans of Western fiction.