Peter Arundsen is bored—bored with his conventional wife, and bored with his respectable job in the city. He hankers after his dangerous past, when he was a spy with the SIS, and cherishes his contact with ex-colleagues, disbanded members of ‘The Firm’, at weekend parties hosted by their old chief, Philip Wetherby.
When one of these parties is overshadowed by news of a defection, Arundsen resists Wetherby’s request to investigate. But he cannot resist Wetherby’s beautiful and mysterious niece. He finds himself, against his better judgement, drawn into the investigation, and so into a tangle of treason, intrigue—and a trap from which it seems there is no escape.