A Surrendered Heart (Broadmoor Legacy #3) by Tracie Peterson, Judith Mill

When cholera strikes Rochester, NY, most of the members of the Broadmoor family flee to their castle home in the Thousand Islands. But Amanda Broadmoor resolves to remain in Rochester to help control the spread of the dreaded disease. However, much more than Amanda's health hangs in the balance. Mishandling of the family fortune threatens to leave the Broadmoor family penniless and scorned by society unless Amanda is willing to sacrifice her future. Will she be forced to marry a man she disdains in order to save the Broadmoor legacy?