Talking to the Enemy: How states without ‘diplomatic relations’ communicate 
G. R. Berridge
(Macmillan, London, 1994) and pirated by the Internet Archive

Talking to the Enemy

This book begins by discussing the problems of non-recognition and breaches in diplomatic relations, and then considers the advantages and disadvantages of the different methods which states, not in diplomatic relations, employ when they nevertheless need to communicate. These include intermediaries, disguised embassies, ceremonial occasions such as working funerals, the diplomatic corps in third states and at the seat of international organisations, special envoys, and joint commissions. In short, it is concerned with the kind of diplomacy which produced the rapprochement between Israel and the PLO in September 1993.

The contents list and abstracts of each chapter can be found on Springer Link here.

Reviews

This slim volume deals straightforwardly with the pros and cons of the ways that states without diplomatic relations talk to one another. Quite helpful on its somewhat narrow topic, but the per-page cost is the highest I have seen., Francis Fukuyama, Foreign Affairs, vol. 74(2), 1995.

Also reviewed by Costas Constantinou in International Affairs, 1995, vol.71(1), 1995; Percy Cradock in Survival, vol.37(1), 1995; Margaret Doxey in Millennium, 1995, vol.24(1), 1995; and Lorna Lloyd in Political Studies, vol.44(1), 1996. [None available to me remotely.]