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.
