On the run Union Engineer Braxton Wright thought his mission into the south was to extract the contents of a top secret Confederate train. Unbeknownst to him, he was a just a pawn in Alan Pinkerton's plan to break his ace spy Hattie Lawton out of the Castle Thunder Prison. Now free, and in the company of Braxton's childhood friend Laurie as well as a mysterious metal man, Braxton is itching to return north to his safe, quiet drafting board. But...