Sea of Temptation (Blackstone Trilogy #3)
Christine Dorsey

Breaking through the union fleet to deliver supplies to the ailing South was a simple task for a seasoned seaman like Devon Blackstone. Far harder was resisting Felicity Wentworth's captivating charms. Instinct told him she was a Yankee spy - yet from the moment she danced into his embrace, Devon was lost. Alone with her at last on a ship carrying them into uncharted waters, he sore he'd coax more than secrets from her wine-red lips - and steal her heart with a stormy passion that would brand her his for all time!