Q is for Quarry: Sue Grafton
Comments: The is the only book in Sue Grafton's alphabet series that to my knowledge is based on a real case. Kinsey Millhone is employed by two aged law enforcement officers who have been haunted throughout their careers by the unsolved murder of an unidentified girl. Millhone uses all her skills to identify the girl and the reasons for her murder 18 years ago.
The final pages of the book are dedicated to the story of the real "Jane Doe" and include a forensic sculptor's recreation of the unknown girl (paid for by Grafton). While this created a renewed interest in the case and generated several leads, police still have no idea who she is or why she was killed all those years ago.