Like his predecessor Ivan the Terrible, Stalin held on to power with a reign of terror. As with many tyrants, he also projected an image of the "great teacher" so that when he died on 5 March 1953 the nation went into genuine shock and mourning. Searching the BBC and the former Communist archives, Jim Riordan uncovers the witnesses who experienced Stalin's rule first-hand and examines how Stalin kept his powerful hold on the USSR for 25 years.