In 1988, Peggy Carr and several members of her family began experiencing bizarre symptoms, including excruciating pain, muscle weakness, and hair loss.  As doctors struggled to identify the cause, Peggy’s condition rapidly deteriorated.  The culprit?  Thallium, a rare and deadly poison. But how did an entire family become exposed, and who would want them dead?

This week, we’re investigating the terrifying case of Peggy Carr, the medical clues that cracked the mystery, and the eccentric, Mensa-member neighbor with a suspicious interest in chemistry and murder mysteries.  We’re breaking down the toxicology, the undercover investigation, and the shocking discovery that turned an ordinary soft drink into a deadly weapon.