Conan saves Lady Aztrias of Numalia from a pack of wolves. She hires Conan to steal from the wealthy merchant Kallian, who temporarily houses a mysterious bowl from Stygia, said to contain a great treasure. Conan burgles the merchant's house, finds the bowl empty and Kallian dead. The city guard appears and Lady Aztrias accuses him of killing Kallian. The real killer was in the bowl, however: a serpent-man, a big snake with a human head. Conan kills the sepent-man and saves Demetrio. In a vision, Conan sees the Stygian sorcerer Thoth-Amon.