The award-winning New York Times bestseller about the American women who secretly served as codebreakers during World War II—a "prodigiously researched and engrossing" (New York Times) book that "shines a light on a hidden chapter of American history" (Denver Post).
Recruited by the U.S. Army and Navy from small towns and elite colleges, more than ten thousand women served as codebreakers during World War II. While...

A handbook for the budding cryptographer including codes and ciphers, invisible inks, concealment techniques, spy stories and some history.

Discusses military uses of math including navigation, cryptography, ballistics, logistics, and more.

When the archaeologist who asked him to decipher a series of vitally important Templar symbols is murdered, historian Caedmon Aisquith embarks on a dangerous international adventure that leads him to mankind's supreme mystery.

008-012. Using their code-breaking skills, four middle-schoolers solve the mystery of the eccentric man who draws stick figures on his second-floor bedroom window.

Two sisters, one war and an extraordinary family secret. 1939. In the nation's hour of need, brave sisters Patricia and Jean Owtram answered the call of duty. With their fierce intelligence and steely determination, these remarkable young women would stop at nothing to help crack the Enigma code, support Allied troops, and defeat the Nazis. Their top-secret mission would finally see the tide of war turn in Britain's favour... This is their incredible...

"The members of the Code Busters Club take a class trip to Angel Island--the Ellis Island of the West--where they discover a mysterious box with a connection to one of the Code Busters."-- Provided by publisher.