Detective Eduardo Pagan investigates the history of a hand-drawn map, taken from the body of a Japanese soldier during the World War II Battle of Iwo Jima. Wes Cowan follows the story of a cane topped with a coiled snake that has ties to the anti-Abraham Lincoln group, the "Peace Democrats". Elyse Luray traces the origins of the Theremin--one of the first electronic musical instruments--and finds out if a New Mexico man owns one of the fewer than a dozen Theremins in the U.S. built by Leon Theremin himself.