"The Rainbow Trail" by Zane Grey is a Western novel published in 1915. Set twelve years after "Riders of the Purple Sage," the story follows John Shefford, a former clergyman searching for Fay Larkin in the remote Arizona-Utah borderlands. His quest leads him to a hidden Mormon village of "sealed wives," where he encounters a mysterious woman called the Sago Lily. As federal prosecutors arrive to prosecute polygamists, Shefford uncovers secrets that challenge everything he believes about faith, justice, and freedom in the desert frontier. (This is an automatically generated summary.)