In Pennsylvania 1984, a passer-by finds the torso of a woman in a cardboard box. Investigators rely on insect activity analysis by a forensic entomologist to determine when the murder victim was killed. She remained unknown until a year later, when her sister called to report her missing. Eventually she was identified as Edna M. Posey, a local prostitute. Investigators then looked into Donald Ruby, whom Edna had asked to watch her 11-year-old son Randy. Investigators theorized that Donald Ruby had grown fond of Randy and killed Edna to keep her from taking her son back. Donald Ruby was convicted of her murder, but would further forensic entomology change the outcome?