Semidiós Percy Jackson, aún sin memoria, y sus nuevos amigos en Campo Júpiter, Hazel y Frank, van en una búsqueda para librar a la muerte, pero su tarea más grande es unir los campos de griegos y romanos para que la Profecía de los Siete se pueda cumplir. Demigod Percy Jackson, still with no memory, and his new friends from Camp Jupiter, Hazel and Frank, go on a quest to free Death, but their bigger task is to unite the Greek and Roman camps so that the Prophecy of Seven can be fulfilled. Demigod Percy Jackson, still with no memory, and his new friends from Camp Jupiter, Hazel and Frank, go on a quest to free Death, but their bigger task is to unite the Greek and Roman camps so that the Prophecy of Seven can be fulfilled.

Translation of: Son of Neptune. Heroes of Olympus II. Título original: Heroes of the Olympus 2. The Son of Neptune.