In the first weeks after World War II, a squeaky-clean new second lieutenant named James D. Cronley Jr. is spotted and recruited for a new enterprise that will eventually be transformed into something called the CIA. One war may have ended, but another one has already begun, against an enemy that is bigger, smarter, and more vicious: The Soviet Union. The Soviets have hit the ground running, and Cronley's job is to help frustrate them, harass them, and spy on them any way he can.

They were the young ones, the bright ones, the ones with the dreams. From the Nazi-prowled wastes of North Africa to the bloody corridors of Europe, they honorably answered the call. War - it was their duty, their job, their life. They marched off as boys and they came back - those who made it - as soldiers and professionals forged in the heat of battle....

From Shanghai to Wake Island, the Corps was America’s first line of defense as the winds of war exploded into the devastating surprise attack on Pearl Harbor. This is the story of the men of the Marine Corps, their loves and loyalties, an elite fraternity united by courage and honor, as they steel themselves for battle, prepared to make the ultimate sacrifice....

It is fall. CIA analyst Jack Ryan, historian and former Marine, is vacationing in London with his wife and young daughter. Suddenly, right before his eyes, a terrorist group launches its deadly attack. Instinctively, he dives forward to break it up, and is shot. It is not until he wakes up in the hospital that he learns whose lives he has saved - the Duke and Duchess of Kent.

US President Keegan Barrett has swept into office on his success as Director of the CIA. Six months into his first term, he devises a clandestine power grab with deadly consequences. Barrett personally orders CIA agents Liam Grey and Noa Himel to execute his plan, but their loyalties are divided. The CIA serves at the pleasure of the president, yet they’ve sworn to support and defend the Constitution of the United States against all enemies, foreign and domestic. When the threat comes directly from the Oval Office, that’s where the blowback begins.