When the Earth was still new, the very difficult, impossible tasks were done by heroes. And first among them was Hercules, who went to bring the gold of the North, guarded along with the herd of cattle by the giant Geryon and Orthrus, his two-headed shepherd dog.   With the Mythological Tales series, a new "reading" of ancient Greek myths is attempted. They are not old, oft-told stories of forgotten gods, but exciting action tales through which all the timeless human adventures, fears, and joys that have marked and still mark the human soul unfold.