A vile greenish vapor was all that remained of Jerome Coffern, first victim of the monstrous Smoke of Eternity. But there would be thousands more if Kar, master fiend, had his evil way. Only Doc Savage and his mighty five could stop him. The corpse-laden trail led to a prehistoric crater and mortal combat with the most destructive killing machines ever invented by nature.

First published in Doc Savage Magazine # 2 April 1933 - written by Lester Dent.