Winner of the CWA Gold Dagger AwardA BBC Front Row best crime novel of the yearA Times crime and thriller book of the year'The finest new crime series this Millennium' Mail on SundayLondon's Slough House is where washed-up MI5 spies go to while away what's left of their failed careers. But now the 'slow horses' have a chance at redemption. An old Cold War-era spy is found dead on a bus outside Oxford, far from his usual haunts. As the agents dig into their fallen comrade's circumstances, they uncover a shadowy tangle of ancient secrets that seems to lead back to a man named Alexander Popov, and a decades-old conspiracy with a brand-new target: London's newest, tallest skyscraper . . .