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In the latest addition to this acclaimed series, readers meet Sgt. Victor Dowd and the 603rd Camouflage Engineers, better known as the Ghost Army--a group of artists and sound engineers who were trained to deceive the Germans in World War II with everything from fake tanks to loudspeakers broadcasting the sound of marching troops. Illustrations.

The true story of Mary Bowser, a former slave-turned-spy who delivered key intelligence secrets during the Civil War. Readers uncover secrets using codes hidden in the book and spycraft materials included.