The summer of 1919 is over, and on the high prairie, a small army of men, women, and machines moves across the land, bringing in the wheat harvest. Custom threshers, steam engineers, bindlestiffs, cooks, camp followers, and hobos join the tide. Prosperous farmers proudly proclaim “Rain follows the plow,” meaning that the bounty of the land will never be exhausted. Everywhere, people gleefully embrace the gospels of progress and greed. The threshing season is on. But there is also an evil upon the land. A killer who calls himself the Windmill Man believes he has a holy calling to water the newly plucked earth with blood. For him, the moving harvest is a target-rich environment, an endless supply of ready victims. He has been killing for years now and intends to kill for many more. Who could stop him? Nobody even knew he existed. Until now.