Madeleine Series by Sadie Conall

Separated by the hatred of the Benedict family, Madeleine seeks revenge, vowing to destroy those responsible and in her desperate quest to find Ryder, she uncovers more than thirty years of treachery and deception, which not only changes her life forever, but those closest to Ryder.

It’s now the spring of 1805 but before they head west to the Snake River Plain, Madeleine, Ryder and Te’tukhe must ride north to the Mandan, an enemy of the Bannock, to trade for a girl Madeleine knew as a child who was taken slave some five years earlier. But first they must part from their son, who they hope to meet at the Lakota within the month, unaware a ruthless killer is tracking them.

It's now September 1808 and Madeleine and Ryder are making plans to leave the Snake River Plain and return to England after more than four years away. Traveling with them on the rivers in two birch bark canoes is Te'tukhe, two young children and a young Bannock man who Madeleine thinks of as her brother. They have just two months to reach the Corrigan Ranch in St Louis before the worst of winter hits, but can they do it, or are Ryder and Madeleine destined to once more be parted from each other.