West Berlin, 1979. Helen Abell oversees the CIA's network of safe houses, rare havens for field agents and case officers amidst the dangerous milieu of a city in the grips of the Cold War. Helen's world is upended when, during her routine inspection of an agency property, she overhears a meeting between two unfamiliar people speaking a coded language that hints at shadowy realities far beyond her comprehension. Before the day is out, she witnesses a second unauthorized encounter, one that will place her in the sight lines of the most ruthless and powerful man at the agency.

Operation Treadstone has nearly ruined Adam Hayes. The top-secret CIA Black Ops program trained him to be an all but invincible assassin, but it also cost him his family and any chance at a normal life. Which is why he was determined to get out. Working as a carpenter in rural Washington state, Adam thinks he has left Treadstone in the past, until he receives a mysterious email from a former colleague, and soon after is attacked by an unknown hit team at his job site.

A car explodes along a quiet Prague side street—among the dead is an undercover Treadstone agent. It's not unusual for such men to meet their fates on an operation, but in this case there's one catch. None of his superiors know what he was doing there.

Aspiring playwright, Kate Gamble, is struggling to launch a script she’s been secretly researching her entire life, mostly at the family dinner table. Her father is Christian Gamble, CEO of Buck Technologies, a private data integration company whose clients include the CIA and virtually every counter-terrorism organization in the Western World. Kate’s father adores her, and a play about the dark side of Big Data would be the ultimate betrayal in his eyes.

CIA Case Officer Sam Joseph is dispatched to Paris to recruit Syrian Palace official Mariam Haddad. The two fall into a forbidden relationship, which supercharges Haddad's recruitment and creates unspeakable danger when they enter Damascus to find the man responsible for the disappearance of an American spy. But the cat-and-mouse chase for the killer soon leads to a trail of high-profile assassinations and the discovery of a dark secret at the heart of the Syrian regime.

1944: As World War II rages on, the threat has come to the home front. In a remote corner of Idaho, Meiko Briggs and her daughter, Aiko, are desperate to return home. Following Meiko's husband's enlistment as an air force pilot in the Pacific months prior, Meiko and Aiko were taken from their home in Seattle and sent to one of the internment camps in the Midwest. It didn’t matter that Aiko was American-born: They were Japanese, and therefore considered a threat by the American government.

Drafted against her will to become a "Sparrow" - a trained seductress in the service, Russian intelligence officer Dominika Egorova is assigned to operate against Nathaniel Nash, a first-tour CIA officer who handles the CIA's most sensitive penetration of Russian intelligence. The two young intelligence officers, trained in their respective spy schools, collide in a charged atmosphere of tradecraft, deception, and inevitably, a forbidden spiral of carnal attraction that threatens their careers and the security of America's valuable mole in Moscow.

Two years ago, a hostile Prime Minister launched the Monochrome inquiry, investigating "historical over-reaching" by the British Secret Service “to investigate historical over-reaching.” Monochrome’s mission was to ferret out any hint of misconduct by any MI5 officer—and allowed Griselda Fleet and Malcolm Kyle, the two civil servants seconded to the project, unfettered access to any and all confidential information in the Service archives in order to do so. But MI5’s formidable First Desk did not become Britain’s top spy by accident, and she has successfully thwarted the inquiry at every turn.

It is 1990 when Melvina Donleavy arrives in Soviet Belarus on her first undercover mission with the CIA, alongside three fellow agents—none of whom know she is playing two roles. To the prying eyes of the KGB, she is merely a secretary; to her CIA minders, she is the only one who can stop the flow of nuclear weapons from the crumbling Soviet Union into the Middle East. For Mel has a secret; she is a “super recognizer,” someone who never forgets a face. But no training could prepare her for the reality of life undercover, and for the streets of Minsk.

As England prepares to fight the Nazis, three very different women answer the call to mysterious country estate Bletchley Park, where the best minds in Britain train to break German military codes. Vivacious debutante Osla is the girl who has everything - beauty, wealth, and the dashing Prince Philip of Greece sending her roses - but she burns to prove herself as more than a society girl, and puts her fluent German to use as a translator of decoded enemy secrets.

If Avery Chambers can’t fix you in 10 sessions, she won’t take you on as a client. Her successes are phenomenal—she helps people overcome everything from domineering parents to assault—and almost absorbs the emptiness she sometimes feels since her husband’s death. Marissa and Mathew Bishop seem like the golden couple—until Marissa cheats. She wants to repair things, both because she loves her husband and for the sake of their eight-year-old son. After a friend forwards an article about Avery, Marissa takes a chance on this maverick therapist.

After a tumultuous period in American politics, a new administration has just been sworn in, and to everyone’s surprise the president chooses a political enemy for the vital position of secretary of state. There is no love lost between the president of the United States and Ellen Adams, his new secretary of state. But it’s a canny move on the part of the president. With this appointment, he silences one of his harshest critics, since taking the job means Adams must step down as head of her multinational media conglomerate

It’s been a decade since Trumanell Branson disappeared, leaving only a bloody handprint behind. Her pretty face still hangs like a watchful queen on the posters on the walls of the town’s Baptist church, the police station, and in the high school. They all promise the same thing: We will find you. Meanwhile, Tru's brother, Wyatt, lives as a pariah in the desolation of the old family house, cleared of wrongdoing by the police but tried and sentenced in the court of public opinion and in a new documentary about the crime.

In a windswept British seaside town, single mum Alice Lake finds a man sitting on the beach outside her house. He has no name and no idea how he got there. Against her better judgment, she invites him inside. Meanwhile, in a suburb of London, 21-year-old Lily Monrose has been married for only three weeks. When her husband fails to come home from work one night, she is left alone in a place where she knows no one and with the police telling her that her husband never existed.

It is 997 CE, the end of the Dark Ages. England is facing attacks from the Welsh in the west and the Vikings in the east. Those in power bend justice according to their will, regardless of ordinary people and often in conflict with the king. Without a clear rule of law, chaos reigns. In these turbulent times, three characters find their lives intertwined.