Q is for Quarry
She was a "Jane Doe," an unidentified white female whose decomposed body was discovered near a quarry off California's Highway 1. The case fell to the Santa Teresa County Sheriff's Department, but the detectives had little to go on. The woman was young, her hands were bound with a length of wire, there were multiple stab wounds, and her throat had been slashed. After months of investigation, the murder remained unsolved...
That was eighteen years ago. Now the two men who found the body are nearing the end of their careers in law enforcement—and they want one last shot at the case. Old and ill, they need someone to help with their legwork and they turn to Kinsey Millhone.
Kinsey is intrigued by the cold case and agrees to take the job. But revisiting the past can be a dangerous business, and what begins with the pursuit of Jane Doe's real identity ends in a high-risk hunt for her killer.
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Sue Grafton
In Sue Grafton's bestselling mystery series, hard-boiled detective Kinsey Millhone is an ex-cop and rebellious loner. Now a private investigator, she solves all the most difficult cases in (fictional) Santa Theresa, California.
In her 30s, Millhone ages one year every 2 1/2 books, from 32 in A to 38 in W. http://www.suegrafton.com/bookshelf.php
Sue Grafton died in December 2017, and her daughter said in the death announcement that Sue had not wanted a ghost writer to continue the series, so the series ends with book 25, Y is for Yesterday.
Kinsey Millhone
Kinsey Millhone consists of twenty-five books. The current recommended reading order for the series is provided below.

