Fortune's Horizon — Andrea K. Stein

She risks everything to deliver gold to the Confederacy. Lillie Coulbourne marks time in Paris while the Civil War rages back home. While translating dispatches for the French Finance Ministry, she accepts a spy mission through the Union blockade. When the captain of the only blockade runner headed back to a Southern port won't deal with women, or spies, she sneaks aboard as his cabin boy. He refuses to risk his ship, or his heart. Blockade runner Captain Jack Roberts has never been caught and he's not about to let a spoiled American heiress ruin his perfect record. After he discovers her deception, he fails miserably at keeping her at arm's length and vows to send her packing on the first mail ship back to England. When she surprises him with her skill as a seaman and navigator, he grudgingly allows her to finish the run. But ultimately, he has to choose what is closer to his heart - Lillie or his ship.