An “invisible” is CIA-speak for the ultimate intelligence nightmare: The terrorist who, because he or she is an ethnic native of the target country, can cross its borders unchecked, move around that country unquestioned, and infiltrate its institutions with ease. An invisible on mainland Britain was the worst possible news. For Liz Carlyle, an MI5 Intelligence Officer, this report from MI6 marks the start of an operation that will test her to the limit and put her own life in jeopardy.

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.

The scion of an old-money San Francisco family, Daniel Brasher left his well-paying, respectable money-manager position to marry his community organizer wife and work at a job he loves, leading group counseling sessions with recently paroled violent offenders. One night he finds an envelope - one intended for someone else that was placed in his office mailbox by accident. Inside is an unsigned piece of paper, a handwritten note that says, "Admit what you've done or you will bleed for it."

Detective Sergeant Chris Waters got the call at 05.29 that July morning. This is it, said DCI Reeve, you'll be first there, it's all yours, you're the crime scene manager. Suddenly, after months of waiting and wondering, Waters finds himself in at the deep end, and alone at the scene of a puzzling murder. As the investigation proceeds, the detectives at Kings Lake Central find themselves visiting familiar places and talking to some familiar faces, while old enmities reappear in the incident room. Before this is over, Chris Waters will need to make a career-changing decision.

Lyndsey was once a top handler in the Moscow Field Station, where she was known as the "human lie detector" and praised for recruiting some of the most senior Russian officials. But now, three Russian assets have been exposed - including one of her own - and the CIA is convinced there's a mole in the department. With years of work in question and lives on the line, Lyndsey is thrown back into life at the agency, this time tracing the steps of those closest to her.

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.

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.

Luke Daniels is in London, between assignments with the Magellan Billet, when he receives a frantic call from an old friend. Jillian Stein is in trouble. She made a mistake and now her life may be in danger. She needs Luke’s help. Immediately. Racing to Belgium Luke quickly finds that she was right. A shadow team of highly-trained operatives are there on the hunt. Intervening, he finds himself embroiled in a war between two determined sides—one seeking the truth, the other trying to escape the past—a war that has already claimed one life and is about to claim more.

"So I thought I might take up paragliding. You know, buy one on eBay and just jump off the cliff one morning." Emily Willows is middle-aged, widowed, wealthy, and bored. When she makes those flippant remarks to her son over coffee one Friday, she has no inkling that within a few hours she will be facing the most terrifying situation of her life.

After the assassination of his wife and son, Gabriel Allon retires from his brutal anti-terrorist career and loses himself in his previous cover job: art restoration. But when Tariq al-Hourani, the Palestinian terrorist responsible for his family’s death, begins a killing spree designed to destroy Middle East peace talks, Gabriel once again slips into the shadowy world of international intrigue. In a global game of hide-and-seek, the motives of Gabriel and Tariq soon become more personal than political.

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.

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.

John Wells is the only American CIA agent ever to penetrate al Qaeda. Since before the attacks in 2001, Wells has been hiding in the mountains of Pakistan, biding his time, building his cover.

Was the biggest case of his career the worst mistake he ever made? Ten years ago, DCI Jack Logan stopped the serial child-killer dubbed "Mister Whisper", earning himself a commendation, a drinking problem, and a broken marriage in the process...When another child disappears a hundred miles north in the Highlands, Jack is sent to lead the investigation and bring the boy home. But as similarities between the two cases grow, could it be that Jack caught the wrong man all those years ago?

A master assassin craves one thing above all else: a normal everyday life. Trained to be a killer from the age of 11, Peter has never known the things the average person takes for granted. He has always been an asset. Burned by the CIA and now occupying their secret hit list, he works overseas as a Ronin, living a solitary life in hiding. But someone knows where he is. A strange man arrives at his door offering Peter the chance of a real life. "Get this done and you can be free," he is told.