Scion of the Serpent (Anok, Heretic of Stygia #1) (Age of Conan Hyborian Adventures)

Anok Wati, a young warrior of the streets, strikes a pact with an ancient and forbidden god who gives him a seemingly impossible task. To unravel the mysteries of the past and avenge his father's death, Anok must join the sinister cult of the snake-god Set--and destroy them from within.