The Envoy (Unabridged‪)‬

The setting is 1950s London, at the height of the Cold War. Kit Fournier is ostensibly a senior diplomat at the US embassy in Grosvenor Square, but is actually CIA bureau chief in London. The Arms Race informs much of the action in this fast-paced story which sees Kit go undercover to meet a dissident KGB agent, lose a loved one, have a crisis of soul and get blackmailed into becoming a double agent for M16....