After Percy and Annabeth's dramatic journey through Tartarus, Percy is left with a life changing decision. Who will stay behind to seal the Doors of Death to Gaia forever? All comes too late when Percy dies at the foot of the doors, with Annabeth forced to watch as the love of her life fades before her eyes. But with Annabeth safely returned to the mortal world, and his friends defeating Gaia and saving the universe, mysterious forces are at work. Exactly a year after Percy's premature death, he wakes in Tartarus, slowly reforming out of the bloody mists. He is lying at the feet of the Doors of Death, now closed, and fully functioning. And the doors still work... "I'll never let you forget me, Annabeth Chase." I breathed, knowing that these were my final moments. " I will never leave you again. I swear that on the river Styx."