Callie Fox and J.D. Fudora wedding date has been set, and so have their plans to move back east for J.D. to pursue his ambitions as an inventor to build steam powered locomotives. Then tragedy strikes the little mining town of Annie's Creek, North Dakota. Callie is torn between leaving her friends and helping them in their time of need, or going away with the man she's loved almost all her life. When speculation of one of J.D.'s gas lighting systems is to blame for the incident in the mines, a lot of folk turn their back on him. He tries to push Callie into moving up the date of their wedding and heading out east sooner rather than later. Rather than prove to Callie it is best to leave Annie Creek, J.D. is shocked when Callie calls off the wedding. J.D. will have to prove to the town his steam driven machines had nothing to do with the incident in order to win Callie's love back, but can Callie say goodbye to all she loves in order to choose a future with J.D.?