The time. . .the 1940s. The place. . .war-torn England. The mystery. . .has only just begun! These are the facts involving a case of spies, secrets, and a baffling riddle at Marble Falls Estate- the home of Jack and Jenny Dunnit. A British spy suspects that one of the Dunnits' acquaintances may be trying to sneak top secret plans out of the country. Jack, Jenny, and fellow amateur sleuth Eliza McClue are observant and clever, but just what does a...