Valka the Wolf Slayer tumbles into the underground kingdom of Agartha. The Master of Masters asks him to battle a black magician plotting to usurp his position. Fighting the dark forces the magician sends against him, Valka breaks his sword. He must descend still further to the underworld forge of Wayland the Great Smith. Wayland and Valka construct a new sword from the fragment of a star. Armed with the star sword, Valka faces the magician in an epic battle to the death.