In the offices of the Homicide Bureau of the Detective Division of the New York Police Department, on the third floor of the police headquarters building in Centre Street, there is a large steel filing cabinet; and within it, among thousands of others of its kind, there reposes a small green index card on which is typed: "ODELL, MARGARET. 184 West 71st Street. Sept. 10. Murder: Strangled about 11 P.M. Apartment ransacked. Jewelry stolen. Body found by Amy Gibson, maid."