One by one, ten little trick-or-treaters get together for an evening of fun and venture over to a dark and scary house, where they are greeted by a monster.

Magnus Pym, Counsellor at the British Embassy, is hosting a dinner party at his home in Vienna when he receives an unexpected telephone call that will profoundly affect his life. Once the guests have gone, Pym breaks the news to his wife, Mary: his father, Rick, is dead. In a state of shock, he says something Mary cannot understand - 'After all these years, I'm free.' Magnus flies back to England to attend the funeral - and doesn't return. As Mary...