Across the moors of Northern Europe, peat-cutters have unearthed hundreds of well-preserved mummies. But what was most baffling was the mummies disturbing injuries: slit throats, decapitation, disembowelment, smashed bones and stab marks. Who were these people, mistaken for the recent dead, but preserved for 2,000 years were they criminals? Human sacrifices? Random victims? National Geographic delves into the mystery of these mummies as experts use cutting-edge technology to uncover new evidence on how these ancient humans lived and died.