For nearly 50 years, the world has believed President Franklin D. Roosevelt's declaration that the Pearl Harbor attack was a completely unexpected assault on a neutral nation. Sacrifice at Pearl Harbor tells another, hidden story - using actual recording of intercepted diplomatic communications, declassified government documents, archival footage and interviews with diplomats and spies from around the world. We now know that intelligence operatives from the US and three Allied nations monitored the Japanese fleet's progress on its deadly mission to Oahu in late 1941. Yet neither Admiral Kimmell nor General Short received a word of warning that might have allowed them to avert the sacrifice of 4,000 American casualties in less than 90 minutes.