Readers should look at the first parts of chapter 13 for this answer. Percy is asking Annabeth about his most recent dream and the cold voice in the chasm. Annabeth says it doesn't sound like Hades's voice, and she finishes by telling him that he can't barter with Hades for anyone. She hints at having come into contact with the "Kindly Ones" before. Percy asks her to explain a bit more, and Annabeth's hand seeks out her necklace. It has a white bead that is painted with an image of a pine tree. The conversation then moves on to Annabeth's dad, and Annabeth coldly explains to Percy exactly how much she loathes that man. She flat-out states that she would leave her father to rot.