From the creator of Downton Abbey. Dr. Thorne lives a quiet life with niece Mary in Greshambury, home of the wealthy Gresham family. Unbeknownst to others, the Greshams have lost their fortune and matriarch Lady Arabella has a scheme to regain it via an arranged marriage with her son and an American heiress. However, her son plans to elope with Mary, which complicates Lady Arabella's plans.