Lord Stanton's Last Mistress by Lara Temple

Lord Stanton's stay on the island of Illiakos is shrouded in memories of fever and his mysterious nurse. Years later, an Illiakan royal visit to Stanton Hall reveals the princess's chaperone, Christina James, is the woman who saved his life! Alexander may be a master of control, but Christina makes him long to unleash the sinful side he's buried…and unlock her passionate nature too!