The "Code Talker" is the first and only memoir by one of the original Navajo code talkers of WWII. The book is dedicated to the 420 World War II Navajo Marine code talkers-- men who developed and implemented an unbreakable communications system that helped ensure the American defeat of the Japanese in the South Pacific. After the war, the code talkers were instructed to keep their role in the war secret-- the code was finally declassified in 1968, 23 years after the war's end. Chester Nez is now the last surviving member of the original 29 code talkers.
Their are any number of web sites that provide information on the code talkers but go to their official Navajo Code Talkers website as a start.