Thanks to Seymour Hersh, Eric finally learns the truth -- but at a maddening cost. In room 1018A, Frank faces off with two mysterious men.

Thanks to Seymour Hersh, Eric finally learns the truth -- but at a maddening cost. In room 1018A, Frank faces off with two mysterious men.

Frank's growing concerns about Cold War activities raise alarm bells at the CIA. A frustrated Eric launches a last-ditch bid for closure.

Frank's growing concerns about Cold War activities raise alarm bells at the CIA. A frustrated Eric launches a last-ditch bid for closure.

A hotel worker overhears a curious phone call the night of Frank's death. In 1994, a forensics expert exhumes the body to find compelling new clues.

A hotel worker overhears a curious phone call the night of Frank's death. In 1994, a forensics expert exhumes the body to find compelling new clues.

One trip to New York morphs into two when Frank suffers a setback on the way home. Decades later, an apprehensive Eric checks into room 1018A.

One trip to New York morphs into two when Frank suffers a setback on the way home. Decades later, an apprehensive Eric checks into room 1018A.

Amid a wave of media attention, the government races to placate the family. In New York, Frank visits a doctor known for his unconventional methods.

Amid a wave of media attention, the government races to placate the family. In New York, Frank visits a doctor known for his unconventional methods.

In 1953, Army scientist Frank Olson takes a fatal plunge from a hotel window. In 1975, a bombshell report ties his death to a top-secret experiment.

In 1953, Army scientist Frank Olson takes a fatal plunge from a hotel window. In 1975, a bombshell report ties his death to a top-secret experiment.