Books in the Beasts of Olympus series in order

A boy is reunited with his long-lost father, the Greek god Pan, only to find himself taken to the kingdom of the gods. What begins as just another ordinary day for Demon ends up being far from normal .

But nothing Demon does has any effect, and Asgard is a strange place - he must contend with Fafnir the ice dragon, ravenous and dangerous Fenrir the wolf and, worst of all, the treacherous trickster god Loki, who is determined to cause mischief.