La porta dei mondi

Looking for the thieves of the mysterious metallic orb of unknown origin, Zagor, Cico, and Professor Verybad reach the mansion of a wealthy man, David Housman, on the Black Lake. Housman ordered his men to steal the orb to add it to his collection of exoteric and occult artifacts. But his action is about to unleash unimaginable forces. While his mansion is sieged by monstrous creatures from another world, Zagor has to travel across the borders of space to prevent hell from breaking out on earth.