Mastermind 2011/12 Episode 27 Episode 27 ( Air Date 2012-04-06 ) Genre Talk category. Overview "In the third semi-final of the series, John Humphrys invites five contenders to answer questions for a place in the Grand Final. Subjects include the life and times of Thomas Wolsey, the apostle Peter in the New Testament, heraldy of Britain, the history of the Monaco grand prix and Catherine the Great.".