Palinode by Annabeth Chase
20 parts Complete Fourth in a series of books based on the Percy Jackson books from Annabeth Chase's perspective. This one follows the Last Olympian. If you haven't read the first three I would recommend doing so.
Series notes:
Book One: Riptide by Annabeth Chase - Complete
Book Two: Backbiter by Annabeth Chase - Complete
Book Three: Scythe by Annabeth Chase - Complete
Book Four: Palinode by Annabeth Chase - Complete
**Trigger warnings - there are minor amounts of emotional neglect, abuse, spiders and self-harm throughout.**