Terrified of being killed by one of his children, Kronos devours each of his offspring in turn. Only Zeus, the youngest, is saved. Though raised to enjoy a life of leisure, Zeus must fulfill his destiny and lead a new race of gods--and he must begin by destroying his own father.

Percy padece dislexia y dificultades para concentrarse. Objeto de burlas por inventarse historias fantásticas, ni siquiera él mismo acaba de creérselas hasta el día que los dioses del Olimpo le revelan la verdad. After learning that he is the son of a mortal woman and Poseidon, god of the sea, twelve-year-old Percy is sent to a summer camp for demigods like himself, and joins his new friends on a quest to prevent a war between the gods.