In a formerly peaceful western valley, a sheriff and his friends battle a corrupt land speculator Pat, Sam, and Ezra came to Powder Valley together, to tame the West and find a place to settle down. Soon, Pat is the sheriff, and Sam is married, but big, powerful Ezra, with his craggy face and missing eye, remains a loner. This state of affairs usually doesn’t get Ezra down, but tonight the big man is too gloomy to eat peach pie. When Ezra can’t eat peach pie, something is wrong—and Pat is certain it has to do with Eustis Harlow. After six months in Powder Valley, Harlow has established himself as the most powerful rancher in the area. Before he came, the locals were content with what they had. Now, half of them are in his debt, and the others have been consumed by greed. With the sheriff and his friends gearing up to quash Harlow’s dominance, the rancher sends for an army’s worth of gunmen. Powder Valley is about to explode.

December 23, 1952. A transcontinental train is stopped cold by a rockslide in a remote Colorado canyon. There’s a murderer aboard, one who has already killed, and will kill again unless stopped. The California Zephyr, with its run from Oakland to Chicago and back, was famous for its Vista-Domes, which provided a 360-degree view of spectacular Western scenery. It was a kind of small city populated by passengers from all walks of life and a large crew whose duty it was to keep them safe. Zephyrette Jill McLeod is the passengers’ primary point of contact. She’s armed for any emergency—with a first-aid kit, a screwdriver, and her knowledge of human nature. But can she figure out a ruthless killer's clever plot in time?