Diamond in Disguise — Elizabeth Hewitt

Despite her own misgivings and the state of war that exists between England and America in 1812, English heiress Isobel Leyland falls for handsome American Adrian Renville, a rugged, self-assured stranger whom she suspects is a spy.

Her Traitorous Heart... Isobel Leyland knew better than to fall in love with the handsome stranger from America, Adrian Renville. Despite his rugged good looks, his powerful animal magnetism, his extraordinary self-assurance, he was socially inept compared to the polished dandies of English aristocratic society -- and a citizen of England's enemy on land and on sea in the War of 1812.

How could she trust this man whom she suspected of playing the boor in a mocking masquerade? How could she stand by him when she suspected that he was betraying her and her native country? But how could she say no to his searing kisses when her own awakened senses screamed yes? If Adrian was using her as a pawn of passion in a game of treachery, it was a game in which her hungering heart was willing to lose...