October, 1962. If the Cuban gamble goes wrong and war breaks out, Britain will no longer exist. London dispatches a secret envoy to defuse the confrontation. Spawned in the bleak poverty of an East Anglian fishing port, Catesby is a spy with a big anti-establishment chip on his shoulder. He loves his country, but despises the class who run it. Loathed by the Americans and trusted by the Russians, Catesby is sent to Havana and Washington to make clandestine contacts. London has authorised Catesby to offer Moscow a secret deal to break the Cuban Missile Crisis deadlock. But before that can happen, Catesby meets the Midnight Swimmer who has a chilling message for Washington.