Hecate has fallen. The Mist is failing and Camp Half-Blood is in danger of being lost... forever. In order to protect their home, Percy and his friends must save the goddess by renewing belief in her amongst her oldest followers, the wizards. Set during TGOF and between HOO and TOA with some demigods introduced in TOA. Percabeth and Solangelo.

Gods and demigods read after the Giant War against Gaea. They read a book about what happens if a key moment in mythology had been different - what would have happened if Kronos hadn't eaten them? The gods find out what Kronos was really like, how it was living in Othrys and just how Kronos and Rhea deal with having to raise their six kids whilst also juggling with their feelings.