At last, it is Charles Ingram's turn in the hallowed hotseat. The first night is disastrous. Two lifelines down when the buzzer goes, Diana determines that they need a new strategy. It is only when Tecwen Whittock, a fellow quiz-fanatic and acquaintance of Adrian and Diana, develops a cough in the audience the following night, that Charles' fortunes begin to change. As Charles stumbles and about-turns his way to a million, the production team grow suspicious - is this man a genius or a cheat? Sure enough their suspicions lead them to a damning a pattern of coughs on the studio recording and the Ingrams are arrested.