This book officially cements "Percabeth" (Percy and Annabeth) as a couple and sets the stage for the Heroes of Olympus sequel series. 2. El Expediente del Semidiós ( The Demigod Files )

While the gods are busy fighting the monster Typhon, the demigods must protect Mount Olympus (the Empire State Building) alone.

Percy Jackson leads the demigods of Camp Half-Blood in a desperate defense of New York City against the Titan Lord Kronos.

The fifth and final book of the original series, The Last Olympian , concludes the Great Prophecy.