When Ingrid Chastain agreed to accompany her father to deliver vaccines to a mining town in the Montana Territory, she never could have anticipated a terrible accident would leave her alone and badly injured in the wilderness. Rescue comes in the form of a mysterious mountain man who tends her injuries, but she's hesitant to put her trust in this man who seems to have wounds of his own.

After tragedy struck his family, Micah Bradley left his work as a doctor and escaped to the wilds of Montana. But his self-imposed solitude is broken when he finds Ingrid in desperate need of medical attention, and he's forced to call on his doctoring skills once again.

Micah can't help but admire Ingrid's tenacity despite the severity of her injuries, until he learns the crate she brought contains smallpox vaccines to help quell a nearby outbreak. With Ingrid dead set on delivering the medicine--with or without his help--he has no choice but to accompany her. As they set off through the treacherous, snow-covered Rocky Mountains against all odds, the journey ahead will change their lives more than they could have known.