Summary

In Chapter 55, Percy and Annabeth jump and land in the doorway of Nyx’s palace. They run with their eyes closed. In the distance, she hears a throbbing sound that feels her with dread. She runs toward it. Percy and Annabeth keep their eyes closed. They do not want to see any of the horrors in the Mansion of Night. As they run, Annabeth begins to hear the sound of flowing water. She begins to runner faster.

In Chapter 56, Percy pulls Annabeth back as her foot hits the edge of a drop-off. He pulls her into an embrace. Percy can sense a river, but they still do not open their eyes. It is the River Acheron. It is the River of Pain, the ultimate punishment for the souls of the damned such as murderers. The voices get into Annabeth’s head...