Host Brad Meltzer enlists America's help to find lost and stolen historical artifacts, which are going missing from museums and public collections at an alarming rate. Among the missing: historic Moon Tapes that hold the clearest footage from the Apollo 11 moon landing. Then, President Lincoln's brilliantly written Bixby Letter that inspired the movie Saving Private Ryan is missing. Plus: the daring heist of George Washington's false teeth from the Smithsonian Museum.