Percy Jackson wasn't afraid of anything. Not the Titans, not the Giants, not even Gaea herself. Nothing could ever shake the son of Poseidon's confidence and (slightly naive) purity. At least, that's what everyone thought. No one could ever have imagined what truly lurked within the shadows of the Hero of Olympus's mind. No one could ever have thought to look past his friendly nature, his warming smile, to see the true torments of his heart. No one but Phobos, that is. When Percy is captured by the god of fear, he must face his inner demons and fight the most formidable opponent he'd ever faced: himself.