Mr. Keen, Tracer of Lost Persons - The Nightmare Murder Case

Mr. Keen's secretary, Suzy, is late to work this morning.  When Suzy appears, she said the Nolan family in the apartment below hers has had some trouble overnight.  The Nolan family consists of Jim Nolan, the father; Mary Nolan, the mother; and Helen Nolan, their daughter.   Helen has accompanied Suzy to work this morning to talk to Mr. Keen.  It seems that her father, Jim is now missing.  He was at home last night, but not this morning.  He also did not show up to his job at the newspaper office.