For almost five decades after the Second World War, Europe was divided by the longest and most heavily guarded border on earth. The Iron Curtain, a near-impenetrable barrier of wire and wall, tank traps, minefields, watchtowers and men with dogs, stretched for 4,300 miles from the Arctic to the Black Sea. Charlie English tells this true story of spycraft, smuggling and secret printing operations for the first time, highlighting the work of a handful of extraordinary people who risked their lives to stand up to the intellectual strait-jacket Stalin created.