Summoned to Shadow Ranch by his friend Ranny Williams, Sim Baldwin arrives to find Ranny has been ambushed and murdered. Sim learns ranch owner Ruth Cameron is under pressure to sell out to Dan Blake, as the dam on the ranch controls the town's water supply. Vowing to avenge his old friend's death, Sim takes up Ruth's fight and incurs Blake's hostility.

King Louis XIII of France is thrilled to have born to him a son - an heir to the throne. But when the queen delivers a twin, Cardinal Richelieu sees the second son as a potential for revolution, and has him sent off to Spain to be raised in secret to ensure a peaceful future for France. Alas, keeping the secret means sending Constance, lover of D'Artagnan, off to a convent. D'Artagnan hears of this and rallies the Musketeers in a bid to rescue her. Unfortunately, Richelieu out-smarts the Musketeers and banishes them forever.