SOI stands for Save our Immortal
it is about a daughter of Selene, a son of Helios, and a goddess of the stars from Helios and Selene born a long time ago. They gang up with Percy and try to bring back Helios and Selene to the Romans.
Characters
Percy Jackson -son of (Neptune)Poseidon
Stella-goddess of stars-parents Helios and Selene
Annabeth Chase-daughter of Athena
Cyrus-son of Helios
Cynthia-daughter of Selene
Leo Valdez-son of Hephaestus
Jason Grace-son of Jupiter
Piper McLean-daughter of Aphrodite
Nico d'Angelo-son of Hades
Reyna Swan-daughter of Diana
Dakota Smith Johnson-son of Mars
Gwen d'Angelo -daughter of Hades
Bobby Solace -son of Apollo
Hazel Wright-daughter of Minerva
Thalia Grace-daughter of Zeus
Chiron- CHB director
Lupa-wolf goddess
Rachel Elizabeth Dare-oracle
the gods/goddess