Wrath of the Triple Goddess

Wrath of the Triple Goddess  is an upcoming fantasy-adventure novel based on Greek mythology by Rick Riordan. It is set to be released on September 24, 2024 by Disney Hyperion. It is the seventh novel of the Percy Jackson & the Olympians series, taking place after the events of The Chalice of the Gods.

Premise
After the events of The Chalice of the Gods, Percy seeks out for his second recommendation letter from the Greek Gods in order to be admitted in the New Rome University. The second one will come from Hecate, the goddess of magic. To earn the letter, Percy and his friends must pet-sit Hecate's pet mastiff, Hecuba, and polecat, Gale while the goddess is away over the week of Halloween. While Percy and Annabeth are out at school, Grover Underwood drinks a strawberry-flavoured potion which turns him into a wild goat and he destroys everything in his sight, leading Hecuba and Gale to run away. Percy and his friends must find the pets and restore the house before Hecate comes back.

Background
Wrath of the Triple Goddess was announced by Riordan on September 26, 2023 at a launch event for The Chalice of the Gods. On January 18, 2024, the cover art was announced alongside the final release date for the project. The cover art was done by Victo Ngai, and the release date was September 24, 2024.

Percy's pet hellhound, Mrs. O'Leary, is confirmed to make an appearance.