A Russian defector is found brutally murdered in a London hotel. Only four people knew he had turned - the four most important and powerful figures in Whitehall. There's only one conclusion - a mole has infiltrated the highest levels of the nation's security. Operating in secret from within Westminster's darkest corners, former spy Solomon Vine must uncover the traitor. Because Britain's future hangs in the balance. And with it the fate of the whole world.

Only she knows the truth. Only he can tell the world. Vienna, 1946. A brilliant German scientist spirited out of the ruins Nazi Europe in search of a new life. Moscow, 1964. A rising star of the British diplomatic service whose job is not what it seems. London, the present day. A once promising academic offered an opportunity to seal his place in history. Their stories, their lives, and the fate of the world, are bound by a single document: The Scarlet Papers. The devastating secrets contained within teased by a brief invitation: Tomorrow 11AM. Take a cab and pay in cash. Tell no one.

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.

After losing his leg to a land mine in Afghanistan, Cormoran Strike is barely scraping by as a private investigator. Strike is down to one client, creditors are calling, and after a breakup with his longtime girlfriend, he’s living in his office. Then John Bristow walks through his door with a shocking story: His sister, the legendary supermodel Lula Landry - known to her friends as the Cuckoo - famously fell to her death a few months earlier.

Northern Ireland, spring 1981. Hunger strikes, riots, power cuts, a homophobic serial killer with a penchant for opera, and a young woman’s suicide that may yet turn out to be murder: on the surface, the events are unconnected, but then things—and people—aren’t always what they seem. Detective Sergeant Duffy is the man tasked with trying to get to the bottom of it all. It’s no easy job—especially when it turns out that one of the victims was involved in the IRA but was last seen discussing business with someone from the loyalist Ulster Volunteer Force.

Shane Collins, a world-weary CIA spy, is ready to come in from the cold. Stationed in Bahrain off the coast of Saudi Arabia for his final tour, he has little use for his mission—uncovering Iranian support for the insurgency against the monarchy. Then Collins meets Almaisa, a beautiful and enigmatic artist, and his eyes are opened to a side of Bahrain most expats never experience, to questions he never thought to ask.

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.

Constantine Lindow is waiting for his brother Eamonn outside a central London tube station when a bus turns into the street and explodes. The next day Con is arrested as the prime suspect for the bombing. Con is determined to prove his innocence, but the only way he can do that is to find the real bomber. As he digs deeper, he finds himself confronted by his own brother's secret life—and the cold-blooded killers from his past.

Robert Harland ended his career as a British spy in an Austrian hospital, after being tortured and beaten by Czech security agents in the last days of the communist regime. He was young enough then to find a new life with the Red Cross and then with the UN.

The world is on the brink of crisis. The Cold War is playing out once more on the global stage. And governments will do whatever it takes to stay at the top. To those who don't really know her, Kate Henderson's life must seem perfectly ordinary. But she is in fact a senior MI6 officer, who right now is nursing the political equivalent of a nuclear bomb. Kate's most recent mission has yielded the startling intelligence that the British Prime Minister has cancer - and that one of the leading candidates to replace him may be a Russian agent of influence.

Bob Howard is a computer-hacker desk jockey, who has more than enough trouble keeping up with the endless paperwork he has to do on a daily basis. He should never be called on to do anything remotely heroic. But for some reason, he is.

Nothing about Emma Makepeace is real. Not even her name. A newly minted secret agent, Emma's barely graduated from basic training when she gets the call for her first major assignment. Eager to serve her country and prove her worth, she dives in headfirst. Emma must covertly travel across one of the world’s most watched cities to bring the reluctant—and handsome—son of Russian dissidents into protective custody, so long as the assassins from the Motherland don’t find him first.

Moscow, 1985. The Soviet Union and its communist regime are in the last stages of decline, but remain opaque to the rest of the world—and still very dangerous. In this ever-shifting landscape, a senior KGB officer—code name GAMBIT—has approached the CIA Moscow Station chief with top secret military weapons intelligence and asked to be exfiltrated. GAMBIT demands that his handler be a former CIA officer, Alex Garin, a former KGB officer who defected to the American side. The CIA had never successfully exfiltrated a KGB officer from Moscow, and the top brass do not trust Garin.

1660 England. General Edward Whalley and his son-in law Colonel William Goffe board a ship bound for the New World. They are on the run, wanted for the murder of King Charles I—a brazen execution that marked the culmination of the English Civil War, in which parliamentarians successfully battled royalists for control.

Nuclear negotiations between the United States and Iran have reached a crisis point. The new American administration is determined to move ahead, but there are several stumbling blocks, not the least of which is Lieutenant Colonel Kasem Khalidi, the former Iranian Quds Force intelligence officer the CIA has hidden away in one of its safe houses. As always, John and Meredith Dale are caught in the middle.