When news of gold in the Yukon reaches the Connolly brothers, they travel north to make their fortune. Settling in the small town of Dominion to stake their claim on the Klondike River, Tom, Padraig, and Samus quickly make both friends and enemies among the eclectic townsfolk.

The feud between Hopkins and the Connollys escalates, and the consequences could be deadly, especially when JJ's domineering father returns to Dominion. Seamus and Kate grow closer, and the brothers continue mining their claim in hopes of finding gold.

The Irish community in Dominion celebrates St. Patrick's Day, while Jacob plots against Samus. Estella works to recruit more innocent girls for the brothel, and Kate keeps a secret from Sam. After finding gold in their claim, the brothers' trust in each other begins to deteriorate.

Tensions between the brothers are worse than ever before, and Tom's obsession with the claim threatens to ruin his other relationships as well. Kate hides her pregnancy from Sam, and when an accident derails Samus's plans to make a fortune, his debt to Jacob could mean he has to betray those closest to him.

Tom and Séamus Connolly are looking to consolidate their position in Dominion but their plans are complicated by the arrival of some new faces to the town. Meanwhile, Pádraig Connolly struggles to help contain an outbreak of typhoid.

Micí Bán Connolly's actions lead to a rift between Tom and Séamus Connolly. The typhoid epidemic worsens, and Kate struggles to come to terms with the discovery that her baby is still alive.

As the date of Captain Pat's trial approaches, a plan is put in place to guarantee Pádraig Connolly's silence. Meanwhile Jacob Hopkins is struck down by the typhoid epidemic that has gripped the town.

In the final episode of this Western series, the town of Dominion is engulfed by murder and mayhem as Captain Pat's plans come to fruition. Tom and Séamus Connolly embark on a mission of revenge.