"The Rainbow Trail, also known as The Desert Crucible, is Western author Zane Grey's sequel to Riders of the Purple Sage. Originally published under the title The Rainbow Trail in 1915, it was re-edited and re-released in recent years as The Desert Crucible with the original manuscript that Grey submitted to publishers.The novel takes place ten years after events of Riders of the Purple Sage. The wall to Surprise Valley has broken, and Jane Withersteen...