Martin Gilmour and Ben Fitzmaurice have been best friends for 25 years, since their days together at Burtonbury School.

They are an unlikely pair: the scholarship boy with the wrong accent and clothes, and the dazzlingly popular, wealthy young aristocrat. But Martin knows no one else can understand the bond they share – and no one else could have kept Ben’s secret for over two decades.

At Ben’s 40th birthday party, the cream of the British establishment gathers in a haze of champagne, drugs and glamour. Amid the politicians, the celebrities, the old money and the newly rich, Martin once again feels that pang of not quite belonging. His wife Lucy has her reservations, too. There is something unnerving in the air. But Ben wouldn’t do anything to damage their friendship. Would he?