One element of the Percy Jackson and the Olympians series that fans have grown to enjoy is how closely the show follows the plot of the Percy Jackson books. Just like in the first book, The Lightning Thief, Percy has to embark on a quest to find and return Zeus' master bolt. However, for a quest to become official, a demigod must first receive a prophecy. To receive prophecies, demigods at Camp Half-Blood ascend to the attic of the main house to consult the oracle. This brings Percy face to face with a being straight from the myths, whose prophecies play a key role in Greek mythology and form the series and the book's main plot.