"Her prose is flawless. Her historical research is absorbing, and her characters are achingly human. This book is fantastic." —Kirkus Reviews (starred review)

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For all of the War Between the States, Marlie Lynch has helped the cause in peace: with coded letters about anti-Rebel uprisings in her Carolina woods, tisanes and poultices for Union prisoners, and silent aid to fleeing slave and Freeman alike. Her formerly enslaved mother's traditions and the name of a white father she never knew have protected her—until the vicious Confederate Home Guard claims Marlie's home for their new base of operations.

Unbeknownst to those under her roof, escaped prisoner Ewan McCall is sheltering in her laboratory. Seemingly a quiet philosopher, Ewan...