Polly Klaas was kidnapped from her home in Petaluma during a slumber party. Two months later, Davis confessed to killing and burying the 12-year-old girl in a shallow grave near Cloverdale.

To investigators at the scene of Polly Klaas’ abduction in early October 1993, the story strained belief. A thick-bearded stranger had entered the 12-year-old girl’s room while she was hosting ...