As senior MI6 Officer Kate Henderson arrives for a weekend away in Venice, a Russian spy enters the city with plans to kidnap her. But it’s not all it seems. The defector offers her conclusive evidence that the British prime minister is a live agent working for Moscow. Kate’s holiday quickly becomes the start of her next mission. With proof of the PM involved in a sordid scandal and a financial paper trail that undeniably links him to the Russians, the evidence seems bulletproof. But is anything in the dark world of espionage ever that simple?

Dr Leo Black is one of Oxford University's rising stars. His lectures play to a packed audience of adoring students. He seems destined for tenure amongst the gleaming spires. But Worcester College has never employed a man like Leo Black before. For 20 years Leo served the SAS with distinction. And when the friend he served alongside is killed in Paris trying to prevent the abduction of a young British scientist, the world Leo has tried to put behind him begins to reel him back in.

In the dying days of the Second World War, a group of Nazis frantically plot the next steps for their country. SS recruits gather east of Berlin to be trained for an audacious yet ill-fated mission to bring about a Fourth Reich. Three decades later, a young British diplomat in East Berlin is compromised after falling into a honey-trap. He contacts Major Edgar, a veteran British spymaster, now retired. Edgar is drawn into an unlikely alliance with an old adversary, Viktor, the veteran Russian spymaster.  

Ryan Drake is a man who finds people who don't want to be found. Once a British soldier, he now works for the CIA, leading an elite investigation team that tracks down missing agents. But his latest mission - to free a prisoner, code-named Maras, and bring her back onto US soil within 48 hours - is more dangerous than anything his team has attempted before. Hunted by his former comrades, Drake is left with no choice but to trust a dangerous woman he barely knows.

It's not unusual for spies to have secrets, but Henry Hunter has more than most, and after he is stopped by British Intelligence at Croydon airport on the eve of the Second World War, he finds he has even more. In March 1941 in Berlin, haunted by a dark episode from his past, he makes a fateful decision resulting in a dramatic journey to the Swiss frontier, with a shocking outcome.

Brexit looms, and Charles Thoroughgood, Chief of MI6, is forbidden for political reasons from spying on the EU. But when an EU official volunteers the EU’s negotiating bottom lines to one of his officers, Charles has to report it. Whitehall is eager for more, but as the case develops, Charles realises that it may not be quite what it appears. At the same time, he finds he has a family connection with a possible terrorist whom MI5 want checked out. In both cases, Charles is forced to become his own agent, seeking what he really does not want to find.

From the refugee camps of Greece to the mountains of Macedonia, a 13-year-old boy is making his way to Germany and safety. Codenamed 'Firefly', he holds vital intelligence: unparalleled insight into a vicious ISIS terror cell and details of their plans. But the terrorists are hot on his trail, determined he won't live to pass on the information. When MI6 become aware of Firefly and what he knows, the race is on to find him. Luc Samson, ex-MI6 agent and now private eye, finds himself recruited to the cause. Fluent in Arabic thanks to his Lebanese heritage, Samson's job is to find Firefly, win his trust and get him to safety.

London, 1963. The Beatles, Carnaby Street, mini skirts. But the new mood hasn't reached the drab and fearful corridors of MI5 and MI6. Many agents joined the secret service to fight the Nazis. Now they are locked in a Cold War against the Russians. And some of them are traitors. The service has been shaken to its core by the high-profile defections of Cambridge-educated spies Burgess, MacLean and now Philby. Appalled at such flagrant breaches of British security, the Americans are demanding a rigorous review.

The intelligence service puts two years and over £100k into the training of new field officers. You're shown how to steal cars, strip weapons, hack bank accounts. There are courses on the use of blackmail and improvised explosives, two workshops solely dedicated to navigating by the stars. But nothing about what I had heard one old spy call whiplash. No one tells you how to go home.

Slough House is Jackson Lamb’s kingdom; a dumping ground for members of the intelligence service who’ve screwed up: left a secret file on a train, blown surveillance, or become drunkenly unreliable. They’re the service’s poor relations – the slow horses – and bitterest among them is River Cartwright, whose days are spent transcribing mobile phone conversations.