The Answer in the Box/Maternal Instinct (S01E04)

Alison Parrott was an exceptional runner, drawing local media attention for her talents. When a photographer contacted her for a running photo shoot, she eagerly accepted, unaware that it would be her last outing. After she disappeared without a trace, police focused on a fellow runner as a suspect, but the investigation stalled. A decade later, cold case detective Vic Matanovic revisited the unsolved mystery, discovering that the key to unraveling the truth lay hidden in a box. While DNA typically secures convictions, the perpetrator had carefully crafted a deceptive narrative to manipulate the jury. In 1981, a brother and sister became victims of their cold-hearted mother, Mary Beth Davis. Three-month-old Seth was hospitalized due to insulin poisoning, resulting in brain damage. Just five months later, his sister Tenga succumbed to caffeine poisoning. Despite the medical examiner's determination of homicide, authorities dismissed the case as accidental. Mary Beth relocated to start anew, putting her past behind her—until ten