Apollo also finds out that the first oracle he has to save is heavily guarded by the mysterious 'Beast' who happens to be the first of the three evil Roman-emperors-turned-Gods, the Roman emperor Nero, who is also the stepfather of Meg McCaffrey. The two undertake a quest to locate and protect a remaining oracle, Dodona, and also hoping to learn how to help the other oracles and regain Apollo's immortality. Believing that he must only undertake a simple quest to regain his immortality, Apollo and Meg travel to Camp Half-Blood with the help of Percy Jackson, where they learn most of the world's Oracles have stopped working. After shenanigans happen, he meets Meg McCaffrey.

The book opens with Apollo landing in a dumpster in an alley in New York City, in the form of a mortal teenager named Lester Papadopoulos because of the events leading up to the war between the Greeks and the Romans. It is told in first-person by the main character Apollo, and it uses haikus for chapter titles. The Hidden Oracle is the first book of the series. The final book of The Heroes of Olympus, titled The Blood of Olympus, takes place about six months before The Trials of Apollo.īooks The Hidden Oracle

Zeus is angry at Apollo for a variety of reasons, most notably for the younger god's allowing his Roman descendant Octavian to rise to power during The Heroes of Olympus series by giving him his blessing. Lester (Apollo) must meet some new friends and train at Camp Half-Blood, save and return 5 undiscovered oracles that have gone dark, and get back to his true form. The series follows the trials of the god Apollo, who has been turned into a mortal named Lester Papadopoulos as punishment from his father and king of the gods Zeus. The fifth book in the series, The Tower of Nero, was released on October 6, 2020. The fourth book in the series, The Tyrant's Tomb, was released on September 24, 2019. The third book in the series, The Burning Maze, was released on May 1, 2018. The second book in the series, The Dark Prophecy, was released on May 2, 2017. The first book in the series, The Hidden Oracle, was released on May 3, 2016.

A supplementary book, Camp Jupiter Classified, has also been released in addition to the main series. It is set in the same world as Riordan's Percy Jackson and Heroes of Olympus series and the references to characters and happenings from earlier stories prove this. The Trials of Apollo is a pentalogy of fantasy adventure and mythological fiction novels written by American author Rick Riordan that collectively form a sequel to the Heroes of Olympus series. Print ( hardcover and paperback), audiobook, e-book

The Dark Prophecy by Rick Riordan