Season Four continues the story of Claire and Jamie Fraser as they try to make a home for themselves in colonial America. The Frasers in North Carolina are at another turning point in history, the edge of the American Revolution. Along the way, the Frasers cross paths with notorious pirate Stephen Bonnet in a fateful meeting that will haunt the family. Meanwhile, Brianna and Roger grow closer in the twentieth century but make a shocking discovery that has them following in Claire2s footsteps.

Follows the story of Claire Randall, a married combat nurse from 1945 who is mysteriously swept back in time to 1743, where she is immediately thrown into an unknown world where her life is threatened. When she is forced to marry Jamie Fraser, a chivalrous and romantic young Scottish warrior, a passionate relationship is ignited that tears Claire's heart between two vastly different men in two irreconcilable lives.