U is for Undertow
Sue Grafton takes the mystery genre to new heights with this twisting, complex #1 New York Times bestseller that draws private investigator Kinsey Millhone into a case shrouded in the sins of the past.
Looking solemn, Michael Sutton arrives in Kinsey Millhone's office with a story to tell. When he was six, he says, he wandered into the woods and saw two men digging a hole. They claimed they were pirates, looking for buried treasure. Now, all these years later, the long-forgotten events have come back to him—and he has pieced them together with news reports from the time, becoming convinced that he witnesses the burial of a kidnapped child.
Kinsey has nearly nothing to go on. Sutton doesn't even know where he was that day—and, she soon discovers, he has a history of what might generously be called an active imagination. Despite her doubts, Kinsey sets out to track down the so-called burial site. And what's found there pulls her into a hidden current of deceit stretching back more than twenty years...
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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.

