There was another detail about the enigmatic visitor that Mrs Henderson missed but later recited, she felt that the neck of the woman wasn't properly "fastened"! The Despards now think that it was the ghost of Madame de Brinvilliers who came back to take revenge on the bloodline of her nemesis, and that is how the specter escaped from a door that was not there.
Mark Despard wants to now exhume the body of his dead uncle and check if he was poisoned or not. Mark enlists two old friends for this clandestine task. Together they open the crypt where the Despards keep their dead, then they open the wooden coffin and find that apparently Miles Despard has escaped from his grave. The Coffin is empty. The Crypt has remained unperturbed since the day Miles was buried with his ancestors. Furthermore, the crypt is made of granite which is impregnable and the question of hidden passages is ruled out. So where did the dead body of Miles go? and who was the women who entered Miles room on the night of his murder and where did she disappear? In this tale of the occult, witches, poisoners and murders nobody is what they seem.