On the vacation of a lifetime in Egypt, an elderly French couple are brutally murdered. Days later, a meticulously planned kidnapping takes place on the streets of Paris. Amelia Levene, the first female Chief of MI6, has disappeared without a trace, six weeks before she is due to take over as the most influential spy in Europe. It is the gravest crisis MI6 has faced in more than a decade. Desperate not only to find her, but to keep her disappearance a secret, Britain’s top intelligence agents turn to one of their own: disgraced MI6 officer Thomas Kell.

Successful novelist Kit Carradine has grown restless. So when British Intelligence invites him to enter the secret world of espionage, he willingly takes a leap into the unknown. But the glamour of being a spy is soon tainted by fear and betrayal, as Carradine finds himself in Morocco on the trail of Lara Bartok - a mysterious fugitive with links to international terrorism.

Nat, a 47-year-old veteran of Britain's Secret Intelligence Service, believes his years as an agent runner are over. He is back in London with his wife, the long-suffering Prue. But with the growing threat from Moscow Centre, the office has one more job for him. Nat is to take over The Haven, a defunct substation of London General with a rag-tag band of spies. The only bright light on the team is young Florence, who has her eye on Russia Department and a Ukrainian oligarch with a finger in the Russia pie.  

The most closely-guarded secret of the Cold War is about to be exposed – the identity of a SIXTH member of the infamous Cambridge spy ring. And people are killing for it.... London, 1992. Late one night, Edward Crane, 76, is declared dead at a London hospital. An obituary describes him only as a 'resourceful career diplomat'. But Crane was much more than that – and the circumstances surrounding his death are far from what they seem. Fifteen years later, academic Sam Gaddis needs money.

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.