Diplomatic negotiations are rarely fully described by their participants in books, for two reasons. They are usually secret until much later, and their intricacies can be boring. Politicians often include brief accounts in their memoirs, but these seldom reveal much about the process as a whole because, as I discovered by interviewing scores of them for my biography of Margaret Thatcher, they cannot avoid focussing almost exclusivelyon what they did and said (or think they did and said).