Cover art
Sumner, Mark. Devil's Tower. Ballantine/Del Rey 1996.

Sumner, Mark. Devil's Tower
Divergence: 1862 CE
What if: The blood spilled at Shiloh caused magic to arise, manifesting as "talents".
Summary: Jake Bird becomes the sheriff of Medicine Rock, Wyoming, and finds himself confronting the evil George Custer.
Series note: Sequel is Devil's Engine.
Published: Ballantine/Del Rey 1996 (034540209XBUY).
Original in: English.
Translation: French by Patrick Couton as La Tour du Diable, L'Atalante 1998 (2841720837); and Pocket 2005 (2266138324).
Awards: Nominee: 1997 World Fantasy Award for best novel.

Sumner, Mark. Devil's Engine
Divergence: 1862 CE
Summary: Jay Gould resurrects the construction of a transcontinental railroad and plans on using it to suck the magic out what remains of the United States, but east will meet west near Medicine Rock.
Series note: Sequel to Devil's Tower.
Published: Ballantine/Del Rey 1997 (0345402103BUY).
Original in: English.
Translation: French by Patrick Couton as La train du Diable, L'Atalante 2000 (2841721248).