Although a drought has forced local cowhands to seek work on a railroad construction project, railraod executives are afraid that their workers will desert them if they believe an old man's claim to have found a way to make rain.

Lucas is the town's representative to the railroad commission until an infamous train robber dies and leaves his ill-gotten wealth to Lucas. Lucas must clear his name and stop the reckless ambition of his replacement.

When Lucas hires an ex-con as a ranch hand, the man is the first one under suspicion when a robbery and murder occur in the area.

In a ghost town, Lucas, Mark and Micah tangle with the Newman family and learn the secret of the town's 20-year-old mystery of a lost gold mine.