Super Short Summary

In Nancy Werlin's young adult thriller The Killer’s Cousin, recently acquitted seventeen-year-old David Yaffe moves to his aunt and uncle's house in Cambridge to finish his senior year and escape his troubled past. He soon realizes his cousin Lily's disturbing behavior and the family's unresolved grief for their deceased daughter Kathy may pose a far greater threat. Sensitive topics such as murder, suicide, and guilt are central to the story.