Released 70 years ago this week in the UK, The Third Man remains one of the greatest films ever made. It's an engrossing, morally ambiguous noir drama set in the ruins of postwar Vienna and it finds Joseph Cotten's Holly Martins searching for the truth behind the death (and alleged crimes) of his oldest friend. Cotten recreated his role in an adaptation from The Lux Radio Theatre (originally aired on CBS on April 9, 1951) - a broadcast that retained the iconic and instantly recognizable zither score from Anton Karras.