In the summer of 1975, a wave of unexplained medical crises swept through the Ann Arbor Veterans Association Hospital. Dozens of patients suddenly stopped breathing - fully conscious and terrified, but completely paralyzed.

When a sharp-witted anesthesiologist recognizes the horrifying symptoms as poisoning by a powerful surgical paralytic, the hospital becomes the center of a massive FBI investigation. Decades later, the mystery of who stalked the halls of the Ann Arbor VA hospital - and why - remains one of America's most disturbing cases.