Inky Darkness

Percy Jackson had a perfect life. However, that was all ruined by his jerky half-brother, who turns his friends on him. Full of grief, he dies in an old, abandoned studio. Years later, Annabeth, finds a letter on her doorstep addressed to her father by "Joey Drew", and a new prophecy is issued, not by the oracle, but by the god Apollo himself. Rated T because I'm paranoid.