Sioux Winter

"My mother is held as a prisoner by the Sioux," Black Eagle said, looking directly at Jamie. "Will you come with me to rescue her?" So Jamie and Kate Bains are summoned on a dangerous mission to help their friend, Black Eagle.
His mother Spotted Bird is being held captive deep in Montana Territory and, unless they find her and set her free, Black Eagle may never see his mother again. To reach their destination, the three friends must travel hundreds of miles across unfamiliar prairie, battle blizzards, the U.S. Army and bands of Sioux warriors, who are the sworn enemies of Black Eagle and the Assiniboine. The obstacles they must overcome are great, but both the Bains and Black Eagle are used to adversity and determined to overcome it.
Set against the harsh landscape of the Canadian and U.S. West, "Sioux Winter" is the story of three friends who fight to overcome great odds and keep a family together. The book is illustrated with photos chronicling this exciting period in Canadian history.
This is the eighth book in the Bains series of historical novels, well-researched, action-filled narratives following the travels of one family across Canada--from Newfoundland to Alberta-- in search of a better life during the hard times of the 1870s.