Hound of Hades

Having proven himself capable of caring for the mythical creatures that dwell on Olympus, eleven-year-old Demon is summoned by the great god Hades to the Underworld to tend to Cerberus, the three-headed dog Guardian of the Underworld, which has been beaten by Demon's nemesis, Heracles.

Demon is summoned by the great Hades to the Underworld. His most-hated hero, Heracles, has just returned Cerberus, the three-headed dog Guardian of the Underworld, to his god master, but something is wrong with the beast, and only Demon can help. Book #2