Plot: The Metropolitan Police Cadet school at Hendon is again the venue where four contenders take their chance in the quest for the title 'Mastermind 1990'. Kate Taylor (freelance writer) The life and Swallows and Amazons books of Arthur Ransome; David Coombs (chartered accountant) The geography of Continental USA; Robert Fromow (guide lecturer) The life and works of Thomas Gainsborough; Brian Bibby (civil servant)The life and operas of Verdi