After learning that the father he never knew is Poseidon, God of the Sea, Percy Jackson is transferred from boarding school to Camp Half-Blood, a summer camp for demigods, and becomes involved in a quest to prevent a war between the gods.

Graphically adapts the adventures of the Greek god of the seas, presenting the myth of how Poseidon became the king of the oceans and such stories as Theseus and the Minotaur, Odysseus and Polyphemos, and the founding of Athens.

Desde que sabe que es hijo de un dios y una mortal, Percy Jackson espera que el destino le depare continuas aventuras. Y su expectativa se cumplirá con creses. Aunque el nuevo curso en la Escuela Meriwether transcurre con inusual normalidad, un simple partido de balón prisionero acaba en batalla compal contra una banda de feroces gigantes. A partir de ahí las cosas se precipitan: el perímentro mágico que protege el Campamento Mestizo es...