A decade after Jane Withersteen, Lassiter, and their adopted daughter, Fay Larkin, escape through Deception Pass in Riders of the Purple Sage, the family faces new trials when Fay is seized for marriage by a local Mormon group. As Fay struggles against the forced coupling, she meets the stalwart John Shefford, a cowboy searching for a new life, and who may be the only one who can save her.