 Montressor is actually Blunt's first wife Gerda, whom he had met alongside Mabelle in India.He had never divorced her when he returned to Britain and married his now-deceased second wife, Rebecca Arnholt; if his bigamy was exposed, he would be shamed and disgraced, and lose the fortune he inherited from her.Blunt had not expected to come across Mabelle when he was leaving Morley's surgery after an appointment; although she recognized him, she didn't know about his new life.