Isabelle “Red” McIntosh in the future (Textbook form)

After solving many “unsolvable” crimes for the Chicago PD Isabelle “Red” McIntosh went on to a very successful career as a mystery writer.  She has written many award winning novels, but still maintains her job at the local library, where she works for free.  She is well known, and helps the police whenever she can.  She never married, but feels that her life has been well spent putting criminals behind bars.   She is sure that even at her advanced age she will solve the 1975 case of  the disappearance of Jimmy Hoffa.