Shortly thereafter, the three are given a quest to rescue Hera from danger. In the woods, Leo discovers a damaged mechanical bronze dragon and rejuvenates it. Meanwhile, Jason finds out about his sister Thalia Grace, a daughter of Zeus and lieutenant of the Hunters of Artemis. Leo, who has the rare ability to conjure fire, does not use nor tell anyone about it out of guilt about his mother's death seven years prior.

There, Leo is revealed as a son of Hephaestus, Piper as a daughter of Aphrodite and Jason as a son of Zeus, though Hera tells him he is her champion. Jason, Piper, and Leo are told that they are Greek demigods and are taken back to Camp Half-Blood. The female demigod, Annabeth Chase, expresses her frustration upon seeing that her missing boyfriend, Percy Jackson, is not there as she expected. A flying chariot with two demigods appear on the scene. In the ensuing fight, Jason battles the spirit and surprises everyone with his powers Hedge is revealed to be a satyr and is captured by the storm spirit as it flees.

All three are part of a class field trip to the Grand Canyon, and after they arrive, a classmate turns into a storm spirit and attacks the trio and their trip leader, Coach Gleeson Hedge. He is placed next to Piper McLean, his apparent girlfriend and Leo Valdez, his apparent best friend. Jason Grace awakens on a school bus, unable to remember anything about his past.

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