Into His Arms (Captain Trilogy #1)
Paula Reed

But Faith Cooper is no illusion, she's a stowaway from Boston Harbor. She's also a delectable flesh-and-blood woman and seems immune to the captain's considerable charms. In fact, Faith is unlike any woman he has ever known—intelligent, unwavering in her beliefs, and truly innocent. Someone who challenges his heart at every turn.
Now, as two unlikely lovers make passage to the warm, sultry winds of Jamaica, a deep, abiding passion flares, giving Geoffrey a treasure he never dared to hope for...and a woman he cannot afford to lose...