Harry is free to offer assistance, but he has firm instructions to stay out of trouble. The victim is a twenty-three year old Norwegian woman who is a minor celebrity back home. Never one to sit on the sidelines, Harry befriends one of the lead detectives, and one of the witnesses, as he is drawn deeper into the case. Together, they discover that this is only the latest in a string of unsolved murders, and the pattern points toward a psychopath working his way across the country. As they circle closer and closer to the killer, Harry begins to fear that no one is safe, least of all those investigating the case.

    And then one night there came a knock at the door of a quiet lodging house in the Marylebone Road. . . . This novel, based on the Jack the Ripper murders, was made into a film by Alfred Hitchcock.