On his way to visit his dying grandfather, Lord Burnleigh encounters Diana St. Aubin at an inn where he believes her to be part of a criminal gang. When he finds her later in the road in distress and brings her to his estate, he does not trust her but enlists her in a plan to pose as his fiancée and so ease his grandfather’s concerns about the succession. Diana meanwhile is trying to figure out what intrigue her missing brother has gotten involved in. As the lord and Diana start to find common ground, the mystery of her brother’s disappearance continues to cause concern.