A Is for Alibi — Sue Grafton

Laurence Fife was a slick divorce lawyer and slippery ladies' man. Until someone killed him. The jury believed it was his pretty young wife Nikki, so they sent her to prison for eight years. Now, Nikki's out on parole and Kinsey Millhone's in for trouble. Nikki hires Kinsey to discover who really killed her husband. But the trail is eight years cold, and at the end is a chilling twist even Kinsey doesn't suspect--a second eight-year-old murder and brand-new corpse.