When Union and Confederate soldiers march by eighteen-year-old Maureen's Sharpsburg farm, she must choose where her loyalties lie. Will she stand with family or country? After the Battle of Antietam, Maureen decides to listen to her heart and volunteer as a battlefield nurse. But her father forbids it and demands she stay home to help care for the farm. The young soldier who loves her fears for her safety. Danger and disease follow her every step of the way. Illness and a tragic turn of events threaten to derail Maureen's mission. When the young woman finds herself a patient in her own hospital, burning up with fever, she questions whether she can go on. In these, the darkest of days, Maureen struggles to summon the strength she needs for the work she is called to do.