It's a true story of deception: Meet the top-secret Ghost Army, a group of artists and sound engineers trained to fake out the Germans in World War II with inflatable rubber tanks and loudspeakers broadcasting the sound of marching troops. And meet real-life Sergeant Victor Dowd, who served in the fight for Normandy, through France, and across the Rhine.

It's a mystery to solve: There are clues embedded in the story's text and illustrations, and Spycraft materials come in an envelope at the beginning of the book. Now put on your own spy thinking cap and find out what happened to Victor Dowd's missing sketchbook.