The Cayman Islands were among the first micro-states to establish a thriving offshore financial services industry by exploiting their historical status as a tax-free jurisdiction. This was threatened when concern about the laundering of the proceeds of drug-trafficking induced the United States to challenge bank secrecy laws in the Caymans and other financial centres. This article demonstrates how decision-makers in the islands shrewdly secured the assistance of their protecting power, Britain, to gain leverage in negotiations with the United States, how they developed a negotiating brief and thereby created model arrangements that permit the exchange of certain financial information, while protecting the financial security of the legitimate patrons of their banks. © 1998 John Wiley & Sons, Ltd.