In November 1971 an unremarkable businessman boarded a Northwest Orient flight, calmly hijacked it with a briefcase bomb, and parachuted into a Pacific Northwest storm with $200,000—then vanished forever. This episode traces the only unsolved skyjacking in U.S. history and the enduring mystery of D.B. Cooper.

In the early 1920s, a wave of targeted killings swept through Osage County, Oklahoma, as wealthy Osage citizens were systematically murdered for their oil headrights. This episode traces the chilling chain of events that began with Anna Brown’s disappearance and exposed a conspiracy involving doctors, lawmen, and guardians who profited from the deaths.

On January 15, 1919, a five-story steel tank in Boston’s North End burst without warning, unleashing two and a half million gallons of molasses in a thirty-five-mile-per-hour wave that killed twenty-one people and injured 150 more. What sounds like a bizarre urban legend was in fact one of the deadliest industrial disasters in American history—and the event that helped rewrite corporate liability law.

In January 1925, the remote gold-rush town of Nome, Alaska faced a deadly diphtheria outbreak with no antitoxin on hand and the Bering Sea frozen solid. Dr. Curtis Welch’s desperate radio plea sparked a legendary 674-mile dog-sled relay through arctic darkness to deliver life-saving serum before the “strangling angel” could claim hundreds of children.