4 March 2018, Salisbury, England. A man and his daughter are found slumped on a bench, poisoned by the deadly nerve agent Novichok. He was a Russian national that became a MI6 spy.

Russia are publicly accused of carrying out the attack by the British government, sparking a diplomatic crisis between Russia and the West.

Then two innocent people find a discarded perfume bottle used in the attack and one of them, Dawn Sturgess, tragically dies. It is now a murder investigation. How exactly did we get here?

In The Skripal Files Mark Urban explains the most shocking espionage incident in a decade. Based on interviews with Sergei before his poisoning, Urban describes precisely how an otherwise loyal Russian intelligence officer was turned into an agent by MI6, how Skripal was betrayed so that he found himself in a Siberian prison, and why, years later, was he was targeted for assassination.