The Guarded Heart — Barbara Hazard

Beautiful Erica Stone left Regency England for Vienna with a husband she barely knew. But she found her husband mysteriously murdered and herself alone in a city of romance, where women were playthings and words of love were lies.

Owen Kingsley, the handsome, cynical Duke of Graves, promised her protection if only she would spy for England among the licentious lords of Europe. Erica, of course, expected that she would be tangling with danger and intrigue and barely raised an eyebrow when her noble targets offered her dubious pleasures at the price of honor. But Erica never dreamed she would soon be wrestling with her own blazing passion for the tantalizingly reserved duke, whose first achingly tender kiss sparked a burning desire in her more powerfully exciting than her heart had ever felt before....