Kirsty Wark celebrates the life and work of Dame Muriel Spark, author of The Prime of Miss Jean Brodie and one of the 20th century's most enigmatic cultural figures, on the one-hundredth anniversary of her birth. Born in Edinburgh, Muriel's extraordinary life took her to colonial Africa, wartime London, literary New York and vibrant 1960s Rome. Her most famous novel - The Prime of Miss Jean Brodie - immortalised the city of her childhood but with an added darkness and acerbic wit that became her trademark style.