Updated at 12:01 p.m. ET on September 15, 2020. E very morning for 20 years, Karl-Heinz Martens steered his yellow mail truck through the narrow streets of Eutin, a market town arranged around a little castle in northern Germany, near the Baltic Sea. On his route, Martens would drive through miles of farms and fields before disappearing into a deep, enchanted forest, where he unlocked a gate using a special key and reversed into his parking spot—as all mailmen do—facing outward to ensure a