The great transept of Lincoln Cathedral is the imposing setting for the second semi-final of this year's Mastermind. Four more first-round winners compete for the second place in the final. Georges Renard (postal executive) The French Second Empire, 1852-1870 Jeremy Bradbrooke (general practitioner) The Anglo-American War of 1812-1815 John Chester (data communications manager) The works of Larry Niven Joy Thwaytes (lecturer and writer) The history of the Mary Rose