Thule, the Nazi Atlantis, legendary home of Aryan superbeings that ruled prehistory. Thule was supposed to be a Nazi myth, but when a defector from the SS occult sciences division, the Karotechia, brings proof of Thule's reality, Delta Green's course is clear: the alien city and its technological and occult secrets must be denied to the enemy at all costs. But the true masters of Thule are fighting their own war. A traitor from the past endangers their eons-old plan to shape the future. The survival of mankind depends on the fate of Thule; but to destroy Thule or save it? Which choice will save mankind? Written by Dennis Detwiller with cover Art by Samuel Araya.