The urgent, explosive story of Russia's espionage efforts against the West from the Cold War to the present - including their interference in the 2016 presidential election.

Like a scene from a le Carre novel or the TV drama The Americans, in the summer of 2010 a group of Russian deep cover sleeper agents were arrested. It was the culmination of a decade-long investigation, and ten people, including Anna Chapman, were swapped for four people held in Russia. At the time it was seen simply as a throwback to the Cold War. But that would prove to be a costly mistake. It was a sign that the Russian threat had never gone away and more importantly, it was shifting into a much more disruptive new phase. Today, the danger is clearer than ever following the poisoning in the UK of one of the spies who was swapped, Sergei Skripal, and the growing evidence of Russian interference in American life.