The fight against Gaea
Rick Riordan,Disney hyperion, 2014,502 pages
The main character is Leo. Reyna, nico, Annabeth, and piper are the other main characters. Nico and Reyna are bringing the Athena Parthenos to half-blood hill so that the gods will be healed. They are shadow traveling to do it. Annabeth and Piper help the Argo 2 with the quests and problems with there help.
All the characters aboard the argo 2 and bringing the statue back to the greeks are trying to the earth mother from waking by fighting her giants along the way.