In 1942 Stanley Johnston is embarked in the aircraft carrier USS Lexington during the Battle of the Coral Sea. In addition to recording the crew's doomed effort to save the ship, Johnston displays great heroism, earning the praise of the Lexington's senior officers. They even recommend him for a medal.

Then his story darkens. On board the rescue ship Barnett, Johnston is assigned to a cabin where messages from the Pacific Fleet commander, Admiral Chester Nimitz, are routinely, and carelessly, circulated. One reveals the order of battle of Imperial Japanese Navy forces advancing on Midway Atoll. Carlson captures the outrage among US Navy brass when they read the 7 June 1942 Chicago Tribune front-page headline, "Navy Had Word of Jap Plan to Strike at Sea." Admirals note that the information in the Tribune article parallels almost precisely the highly secret material in Nimitz's dispatch. They fear Japanese commanders will discover the article, grasp that their code has been cracked, and quickly change it, thereby depriving the US Navy of a priceless military asset.

Drawing on never-before-released testimony, Carlson takes listeners inside the grand jury room where jurors convened by the Roosevelt administration consider charges that Johnston violated the Espionage Act.