For sixty years Elizabeth II has met each of her twelve Prime Ministers in a weekly audience at Buckingham Palace - a meeting like no other in British public life - it is private. Both parties have an unspoken agreement never to repeat what is said. Not even to their spouses. The Audience breaks this contract of silence - and imagines a series of pivotal meetings between the Downing Street incumbents and their Queen. From Churchill to Cameron, each Prime Minister has used these private conversations as a sounding board and a confessional - sometimes intimate, sometimes explosive.