"Discusses the difference between codes and ciphers, common codes and ciphers that have been used during wars, and how to create simple ciphers"--Provided by publisher.

Amy and Dan travel to a distant land to follow in the footsteps of their most formidable ancestor yet, a military leader who teaches them the art of ancient warfare.

Describes how the American military in World War II used a group of Navajo Indians to create an indecipherable code based on their native language.

Describes the use of the Navajo language in World War II, discussing why it was used, how the code was developed, and the Native Americans who bravely fought for the United States.

When Amy and Dan Cahill's quest to find the million dollars takes them to Japan, they must decide whether or not to enter into an alliance with their uncle, Alastair Oh, whose motives for helping them are extremely questionable.

A sweeping history of the NSA and its codebreaking achievements from World War II through the Cold War shares insights into the challenges faced by cryptanalysts and their role in some of the most complicated events of the twentieth century.

It is April of 1942, and 28-year-old Jimmie Goodluck leadsd an aimless existence on the Navajo reservation, where he knows only poverty, prejudice, and lack of opportunity. Everything changes whenhe hears a U.S. Marine Corps recruitment message on the radio. Without a second thought, Jimmie heads out toward what he hopes will be a new and meaningful life. As a marine recruit, Jimmie becomes a code talker. he ahd his small, all-Navajo platoon develop...

Throughout the hunt for the 39 Clues, Amy and Dan Cahill have uncovered history's greatest mysteries and their family's deadliest secrets, but are they ready to face the truth about the Cahills and the key to their unmatched power? After a whirlwind race that's taken them across five continents, Amy and Dan face the most the difficult challenge yet -- a task no Cahill dared to imagine. When faced with a choice that could change the future of the world,...

"Discusses the heroic actions and experiences of the Navajo code talkers and the impact they made during times of war and conflict"--