Nurse Mercy Lynch is elbows deep in bloody laundry at a war hospital in Richmond, Virginia, when Clara Barton comes bearing bad news: Mercy's husband has died in a POW camp. On top of that, a telegram from the west coast declares that her estranged father is gravely injured, and he wishes to see her. Mercy sets out toward the Mississippi River. Once there, she'll catch a train over the Rockies and--if the telegram can be believed--be greeted in...