On April 15, 1920, two men were shot dead on a Massachusetts street in a payroll robbery, and the men eventually executed for the crime may or may not have pulled the trigger. In this episode, I examine the Sacco-Vanzetti case not as a political symbol but as a genuine unsolved mystery: a double murder, a biased trial, a suppressed confession, and a question that a century of forensic science has never fully answered. Understanding this case means holding multiple truths at once about justice, fear, and what happens when a legal system is too frightened to be fair.