Your Mission: Find Mary’s secret diary using spycraft stools to uncover hidden codes!It’s a true story of bravery: Mary Bowser was an African American spy for the Union who worked as a maid in the mansion of Confederate Jefferson Davis. From hair-raising close calls when she almost gets caught to how she uses her photographic memory to “steal” top secret documents. Mary’s story reads like a gripping novel.It’s a mystery to solve: This hardcover library edition does not include any removable spy tools; a canny reader will unravel clues embedded in the text and illustrations to solve the book’s ultimate mystery and experience history in a whole new way.