A Is for Alibi by Sue Grafton

A IS FOR AVENGER. A tough-talking former cop, private investigator Kinsey Millhone has set up a modest detective agency in a quiet corner of Santa Teresa, California. She's a twice-divorced loner with few personal possessions and fewer personal attachments but with a soft spot for underdogs and lost causes.

A IS FOR ACCUSED. That's why she draws desperate clients like Nikki Fife. Eight years ago, she was convicted of killing her philandering husband. Now she's out on parole and needs Kinsey's help to find the real killer. But after all this time, clearing Nikki's bad name won't be easy.

A IS FOR ALIBI. If there's one thing that makes Kinsey Millhone feel alive, it's playing on the edge. When her investigation turns up a second corpse, more suspects, and a new reason to kill, Kinsey discovers that the edge is closer--and sharper--than she imagined.