In December 1941, Japan attacked multiple targets in the Far East and the Pacific, including Canadian battalions in Hong Kong. This intriguing account of Canadian intelligence gathering and strategic planning on the eve of the crisis dispels the assumption that the Allies were totally unprepared for war. Canadians worked closely with their US and Allied counterparts to uncover Japan's intentions and to develop a strategic plan for defence. By highlighting Canada's role as a Pacific power, this book sheds new light both on the Pacific War and on events that led to the creation of the Grand Alliance.