Pearl Harbor, the unfought battle

This book is a fantasy based on what might have happened had the military commanders in Hawaii had found out that a Japanese spy was reporting back details of the ships' anchorages in Pearl and the army and navy air bases. This was known about in Washington but not, in reality, shared with the local commands.
The narrative begins in late November 1941 with real events but quickly involves into a 'what might have been' speculation or fantasy.