Confused and disoriented, Georgina Ferrars awakens in a small room in Tregannon House, a private asylum in a remote corner of England. She has no memory of the past few weeks. The doctor, Maynard Straker, tells her that she admitted herself under the name Lucy Ashton the day before, then suffered a seizure. When she insists he has mistaken her for someone else, Dr. Straker sends a telegram to her uncle, who replies that Georgina Ferrars is at home with him in London: "Your patient must be an imposter." Suddenly her voluntary confinement becomes involuntary. Who is the woman in her uncle's house? And what has become of her two most precious possessions, a dragonfly pin left to her by her mother and a writing case containing her journal, the only record of those missing weeks? Georgina's perilous quest to free herself takes us from a cliffside cottage on the Isle of Wight to the secret passages of Tregannon House and into a web of hidden family ties on which her survival depends.