Michael Phillips 
Land of the Brave and the Free (The Journals of Corrie Belle Hollister Book #7) 

Pursued as a Union spy inside Confederate territory, Corrie’s desperate attempt to escape on horseback is cut short by the sound of gunfire and the excruciating pain in her back from a bullet. Mercifully, the fear and pain are quickly overtaken by darkness as the reins slip through her fingers. When Corrie slowly awakens from weeks of unconsciousness, the first face she sees belongs to Christopher Braxton, the young man who found her nearly dead on the roadside and carried her to safety. As she is nursed back to health, Corrie finds that the physical damage to her body is not nearly as difficult to treat as her lingering amnesia. Beginning with the single letter in her pocket, Corrie and Christopher struggle to piece together the limited clues to Corrie’s past.