How do you continue living when life collapses around you in a single day?

Marguerite Wadin MacKay believes her 17-year marriage to explorer Alex MacKay is strong-until his sudden fame destroys it. When he returns from a cross-Canada expedition, he announces their frontier marriage is void in Montréal where he plans to find a society wife-not one with native blood. Taking their son, MacKay sends Marguerite and their three daughters to a trading post where she lived as a child. Deeply shamed, she arrives in time to assist young Doctor John McLoughlin with a medical emergency.

Marguerite now lives only for her girls. When Fort William on Lake Superior opens a school, Marguerite moves there for her daughters' sake and rekindles her friendship with Doctor McLoughlin. When he declares his love, she dissuades him from a match harmful to his career. She's mixed blood and nine years older. But he will have no one else.

After abandonment, can a woman love again and fulfill a key role in North American History?