River of Peril - Spies of the Civil War, #5

Amnesia stole his memory, and now he's fighting for the wrong side. Orphaned and alone at sixteen, Felicity has found solace in serving others as a volunteer nurse. When she discovers her Confederate soldier beau, Luke Shea, among the wounded in her ward, her worst nightmares come true. Luke's shrapnel wound has stolen his memory, leaving him with no recollection of their love or his past. As Felicity struggles with the loss of the man she once knew, she turns her attention to the service of her broken country.
But the more she learns about the brutal war, the more she realizes she can no longer stay silent. She becomes a Union spy, plunging herself into danger. When Luke Shea awakens in a hospital with no memory of the last five years, he's shocked to hear he's been fighting against the Union he once so strongly supported. And when he learns of his past courtship with his nurse, Felicity, he struggles to understand the man he was, and what the amnesia seems to be hiding from him.
Unable to pursue a relationship with Felicity until he uncovers his past, Luke throw himself back into the service of his country-this time as a Union Spy. Will the danger lurking at every turn rob them of a second chance for love and the future they both crave?