Late one evening in March 1924, a tipsy young nun was seen trying to slip into Balliol, an all-male Oxford college, just as the gates were about to close for the night. The nun - subsequently unmasked as the son of the college bursar - was returning after a fancy-dress party at a notorious Oxford social club, one known to the university proctors for its hedonistic ways, heavy drinking and wayward behaviour. This was the final straw; the club...