The Parisian Madame L'Espanaye and her daughter Camille are found gruesomely murdered on the fourth floor of their otherwise empty house. Yet all the doors and windows to the room are locked from the inside. How could the murderer have escaped? The brilliant detective Auguste Dupin sets out to shed light on this baffling case. - Englischsprachige Ausgabe - Mit einer englischen Biographie des Autors