The once-lawless frontier settlement has grown into a town on the threshold of South Dakota's statehood and modernization. Still, the past isn't easily dismissed as old feuds are revived, sins recalled, and allegiances tested.

The ruthless four : After a lifetime of prospecting, Sam Cooper has struck gold. But he can't get it without partners, without trusting someone. The person he trusted to be his partner has betrayed him and now he must deal with a streak of bad luck as he fights off bandits, losing his horse and gun. In order to retrieve the gold, he must go back to the desert where it is hidden. Accompanied by his adopted son and some of his sinister friends, Cooper...

Endeavour and his colleagues are entering a new decade and era of change. Opening on New Year's Eve 1969, normal order has been resumed and the team reunited at Castle Gate CID, with Chief Superintendent Bright back in charge. However, the events of the past year have left their mark. Old friendships will be challenged, and new relationships will blossom.