In Monroe, Ohio, an affluent retirement community is baffled after Barbara Howe simply vanishes one night; the police soon find Barbara's body in the trunk of her car, and her throat has been slit.

In Moscow, Idaho, an elderly couple frantically performs CPR on their young neighbor after a pop of gunfire interrupts their bedtime routine; investigators follow fresh footprints from the scene, only to learn the killer may already be behind bars.