While investigating the reappearance of the long-presumed-dead Wendell Jaffe, Kinsey Millhone uncovers some unpleasant truths about her own family in the process.

"Of #1 New York Times-bestselling author Sue Grafton, NPR's Maureen Corrigan said, "Makes me wish there were more than 26 letters." With only one letter left, Grafton's many devoted readers will share that sentiment. The darkest and most disturbing case report from the files of Kinsey Millhone, Y is for Yesterday begins in 1979, when four teenage boys from an elite private school sexually assault a fourteen-year-old classmate--and film the attack....