Andrew
Andrew asked Mark Sumner:

I am a big fan of the Devils Tower and Devils Engine. Do you ever have thoughts about a third novel in that word of Old West and Magic?

Mark Sumner Hey, wow. Sorry I left this unanswered for so long.

Yes, there was always a third novel planned. Originally the three books were called Range, Rail, and Rifle. But after Del Rey's marketing department changed things, that turned into Devil's Tower, Devil's Engine, and Devil's Crusade. Crusade exists only as a half dozen chapters and an outline, as Del Rey cancelled my contract... in the same week Devil's Tower was named as a finalist for the World Fantasy Award. I'd love to get back to it, but it would first require some way to get the initial volumes back in print.

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