Marc Almond travels to Moscow in search of the marvelous Russian tenor Vadim Kozin, tango-singer and superstar. The darling of the Soviet Union, Kozin melted hearts by the tens of millions in the 1940s, playing to packed concert halls and rallying Red Army troops in World War Two. But he vanished one day in 1944 when the secret police arrested him and sent him to the Gulag for homosexuality