Mary Rose Moreland and Simon Blake are the perfect couple: successful young professionals in Philadelphia, attractive, madly in love, and ready to start a life together. When they travel to England for Simon to ask her parents' permission to marry Mary Rose, he learns an unsettling secret: Mary Rose disappeared when she was a little girl while the family was vacationing on a remote Scottish island. She reappeared mysteriously thirty-three days later in the exact same spot without a scratch on her and no memory of what had happened.