In the quiet Cotswolds village of Great Rollright in 1944, a thin and unusually elegant housewife emerged from her cottage to go on her usual bike ride. A devoted mother of three, attentive wife and friendly neighbour, Sonya Burton seemed to epitomise rural British domesticity. However, rather than pedalling towards the shops with her ration book, Sonya was heading for the Oxfordshire countryside to gather scientific secrets from a nuclear physicist. Secrets that would enable the Soviet Union to build the atomic bomb.

D-Day, 6 June 1944, the turning point of the Second World War, was a victory of arms. But it was also a triumph for a different kind of operation: one of deceit. At the heart of the deception was the 'Double Cross System', a team of double agents whose bravery, treachery, greed and inspiration succeeded in convincing the Nazis that Calais and Norway, not Normandy, were the targets of the 150,000-strong Allied invasion force.

One December night in 1942, a Nazi parachutist landed in a Cambridgeshire field. His mission: to sabotage the British war effort. His name was Eddie Chapman, but he would shortly become MI5's Agent Zigzag. Dashing and suave, courageous and unpredictable, Chapman was by turns a traitor, a hero, a villain and a man of conscience. But, as his spymasters and many lovers often wondered, who was the real Eddie Chapman?

In the summer of 1941, at the height of the war in the Western Desert, a bored and eccentric young officer, David Stirling, came up with a plan that was imaginative, radical and entirely against the rules: a small undercover unit that would wreak havoc behind enemy lines. Despite intense opposition, Winston Churchill personally gave Stirling permission to recruit the most ruthless soldiers he could find. So began the most celebrated and mysterious military organisation in the world: the SAS.

On a warm July evening in 1985, a middle-aged man stood on the pavement of a busy avenue in the heart of Moscow, holding a plastic carrier bag. In his grey suit and tie, he looked like any other Soviet citizen. The bag alone was mildly conspicuous, printed with the red logo of Safeway, the British supermarket. 

A gripping tale of betrayal and counterbetrayal that tells the story of the most enigmatic member of the Cambridge spy ring - Donald Maclean. Donald Maclean was a star diplomat, an establishment insider and a keeper of some of the West's greatest secrets. He was also a Russian spy, driven by passionately held beliefs, whose betrayal and defection to Moscow reverberated for decades. 

On 3 May 1961, after a trial conducted largely in secret, a man named George Blake was sentenced to an unprecedented 42 years in jail. By his own confession he was a Soviet spy, but the reasons for such a severe punishment were never revealed. To the public, Blake was simply the greatest traitor of the Cold War. Yet his story touches not only the depths of treachery, but also the heights of heroism.

Guy Burgess is the most important, complex and fascinating of 'The Cambridge Spies' - the group of British men recruited to pass intelligence to the Soviets during World War Two and the Cold War. Burgess' story takes us from his student days in 1930s Cambridge, where he was first approached by Soviet scouts, through his daring infiltration of the BBC and the British government to his final escape to Russia and lonely, tragic-comic exile there.

On November 1, 2006, Alexander Litvinenko sipped tea in London's Millennium Hotel. Hours later, the Russian émigré and former intelligence officer, who was sharply critical of Russian president Vladimir Putin, fell ill and within days was rushed to the hospital. Fatally poisoned by a rare radioactive isotope slipped into his drink, Litvinenko issued a dramatic deathbed statement accusing Putin himself of engineering his murder.

Spring 1958: a mysterious individual believed to be high up in the Polish secret service began passing Soviet secrets to the West. His name was Michal Goleniewski, and he remains one of the most important yet least known and most misunderstood spies of the Cold War. Even his death is shrouded in mystery and he has been written out of the history of Cold War espionage - until now. 

This is the incredible tale of Operation Fifth Column, a Second World War MI5 operation so secret that its existence was revealed by the National Archives for the first time only in 2014. Throughout the war and even for a couple of years afterwards, 'Agent Jack' - in reality, a bank clerk named Eric Roberts - acted as a Gestapo agent to whom hundreds of British-based Nazi sympathisers and informers passed their secrets, thinking that he was sending them back to Germany.

Written after The Lion, the Witch, and the Wardrobe but designed by C.S. Lewis to be read first, this enchanting prequel, with its story of time travel, sorcery, and magic rings, is essential reading for anyone who wants to learn the backstory to the biggest movie release of the year. Hurled back in time to the birth of a new world, two young friends get caught in the epic struggle between Aslan and his nemesis the White Witch.

In the aftermath of the Cold War, US intelligence caught three high-profile Russian spies. However, these arrests left major questions unanswered, and rumours have long swirled of another mole, often referred to as the Fourth Man. Three pioneering female veterans of counterintelligence were tasked with unearthing him. With steadfast determination and expertise, they came to a shocking conclusion, one which had, and continues to harbour, dramatic consequences for American security.

January 1895: On a freezing morning in the heart of Paris, an army officer, Georges Picquart, witnesses a convicted spy, Captain Alfred Dreyfus, being publicly humiliated in front of 20,000 spectators baying ‘Death to the Jew!’ The officer is rewarded with promotion: Picquart is made the French army’s youngest colonel and put in command of ‘the Statistical Section’ - the shadowy intelligence unit that tracked down Dreyfus.

Berlin was in ruins when Soviet forces fought their way towards the Reichstag in the spring of 1945. Streets were choked with rubble, power supplies severed and the population close to starvation. The arrival of the Soviet army heralded yet greater terrors: the city's civilians were to suffer rape, looting and horrific violence. Worse still, they faced a future with neither certainty nor hope.