I Need You to Read This by Jessa Maxwell

Alex Marks is a solitary, lonely young woman in New York City, grateful for a remote copywriting job, although it barely pays the rent, and her daily breakfast at the Bluebird Diner, where she has two friends, sarcastic waitress, Janice, and retired policeman, Raymond. Although it happened months ago, she is still devastated by the unsolved murder of Francis Keen, who wrote the popular Dear Constance advice column for the New York Herald.