The episode details the unsolved mystery of D. B. Cooper, a man who, in November 1971, hijacked a Boeing 727, demanded a ransom and parachutes, and then vanished mid-flight. The podcast describes the hijacking's precise events and the subsequent FBI investigation, which yielded minimal evidence. Finally, it explores various theories about Cooper's identity, background, and whether he survived, examining several prominent suspects and the evidence for and against each.