It's summer of 1899 and the state of Wyoming has been unresponsive for an increasingly alarming amount of time. No mail nor telegram communication has ever been sent out or responsive, which has prompted the United States Postal Inspection Service to investigate. The inspector general has selected US Postal Inspector Jed Pluck from Boston, Massachusetts to team up with another postal inspector named Louie Secoli to investigate these towns along the railroad. The peculiarity of this case, in contrast to others they had investigated previously, is that the only evidence they have is a strange, large black-red feather, sharp enough to slice through skin.
Leaving his family once again, Jed hitches the train with Louie, and they set off for Wyoming. Upon arriving in Cheyenne, they found Wyoming's capital deserted-and covered in the very same peculiar feathers. The next few towns along the railroad all share the same description: no bodies in sight and covered in the same feathers.
Only one town along the railway has been spared from the disappearances. Lemonstown, a town near the Red Desert, remains active but unaware of the fate of the other towns. Fearing that Lemonstown would be the next town to be raided, the two postal inspectors must solve the mystery of the strange creature and help the townspeople before Lemonstown becomes the next ghost town covered in feathers.