Arne Saknussemm, a learned Alchemist of the sixteenth century, to be charged with heresy, fleeing from the face of the earth, he returns to an opening within the depths of an extinct volcano known as Snaeffels.

Within the entrance of the caverns, he journey's yet through other avenues with discoveries new and perilous. Finding wonders unthinkable.

In his travels, he encounters a world of prehistoric creatures surviving in a terrain of times past. He finds himself attempting to allude Neanderthal men, beasts only to devour him for their thirst for blood. An impenetrable metal door, a lost pyramid, sea creatures, and the remains of Hominid apes. In the end, a battle with a giant lizard. Never to return finding only a demise of a slow death.