After the attack on Pearl Harbor, the U.S. Navy knew it would need vital information from the Pacific. After a meeting and a handshake agreement with Chiang Kai-shek, the Sino-American Cooperative Organization was born. This top-secret network worked hand in hand with the Nationalist Chinese to fight the Japanese occupation of China while it intercepted Japanese code, laid mines, and trained Chinese peasants in guerrilla warfare. Its work supplied critical information to the U.S. and contributed to the felling of more than 70,000 Japanese – while losing only five of their own men. SACO – “the rice paddy navy” – was one of the best-kept secrets of the war. Linda Kush uncovers the military accomplishments and political wrangling that colored one of the most successful – and little known – efforts of World War II.