Mastermind 2013/14 Episode 4 Episode 4 ( Air Date 2013-08-30 ) Genre Talk category. Overview "John Humphrys asks the questions as the hunt continues for the nation's Mastermind. Subjects are: Six Feet Under, the life and times of James Ramsay Macdonald, the city of London parish churches of Sir Christopher Wren and the life and work of Alun Lewis.".