Wrath of the Titans: Force of the Trojans #2

As Apollo and Artemis lead an expedition to find the last of the Oracles of Delphi, King Minos — the mortal who would be a god — closes his trap unleashing horrific abominations from the depths of the sea. Fighting their way across the Mediterranean on their quest, the twin gods of Olympus discover that one of those under their command is a traitor.