The Intrepid Miss Laroque — Betty J. Vaughn

Cissy tries to put her feelings away and consider Brandon, but despite his continued interest, she realizes it is Ryan that holds her heart. Ryan, who was attracted to Cissy even before he met his wife, is free to pursue her at last.
When Wilmington falls in February of 1865, Cissy LaRoque no longer needs to spy. That will not stop her from finding a new career where she can prove her worth beyond societal expectations of a woman. With the war drawing to an end and Wilmington occupied, she is faced with desperate circumstances. Ryan Madison, a Union officer from the past, and Brandon McLean, a new one, attempt to help her. While attracted to them both, she is aware of family and community hostility toward the enemy and dares not act on the attraction. Her fiance, Logan who is fighting for the southern cause, does not arouse her ardor like the two Union men. When the Confederacy falls, she convinces her father to allow her to run his shipping office in New Berne while he maintains the main office in Wilmington. There she discovers Ryan has married and Logan has jilted her. Provoked and titillated by a man she cannot have but craves, she puts aside romance and concentrates on business. Despite her father's initial objections, much to his surprise she succeeds far beyond any expectation. Although she is happy in what she has achieved, she is frustrated by what she has lost.