Scott Davis 
Orion the Hunter #2 [EPUB ebook] 

A cancer is eating away at the Pantheon’s influence over the mortal world. Far from their glory days 3000 years in the past, a new struggle for dominance erupts between the older gods and their offspring … and Orion is caught in the middle. Orion needs to find the missing Eye of the Oracle before it falls into the wrong hands and he must look into his painful past to find it … a journey that will lead him directly to the mouth of Hades. Second of the four-part series.