MI5 is on its knees at the dawn of the 1970s: Soviet spies are running free around the country and the government won’t boot them out for fear of upsetting Moscow. But the danger from inaction is growing because a spy from the KGB’s most-secret department has just been posted to London. His name is Oleg Lyalin and he’s on a mission to take down Britain’s nuclear defences. See Privacy Policy at https://art19.com/privacy and California Privacy Notice at https://art19.com/privacy#do-not-sell-my-info.