Sergeant Seamus Donegan, tracking his uncle Ian O'Rourke, arrives at Tule Lake just in time to be caught up in the war between the Army and the Modoc Indians.

Colonel George Armstrong Custer hires eighteen-year-old Allen Winslow as an aide for his 1876 campaign against the Sioux and Cheyenne. Traveling west, Allen finds himself in the company of Addie Grace Lord, sixteen, whose brother is a regimental surgeon. They fall in love, and it is with foreboding that Addie Grace watches Allen and her brother ride out with the Seventh Cavalry. Weeks later in Montana, the Seventh brings its quarry to bay beside the...