Jason, Piper, and Leo, three students from a school for "bad kids," find themselves at Camp Half-Blood, where they learn that they are demigods and begin a quest to free Hera, who has been imprisoned by Mother Earth herself.

"Greek and Roman demigods from the Prophecy of Seven must work together to seal the Doors of Death--and help Percy and Annabeth escape the Underworld in the process"-- Provided by publisher.

Jason, Piper, and Leo, three students from a school for "bad kids," find themselves at Camp Half-Blood, where they learn that they are demigods and begin a quest to free Hera, who has been imprisoned by Mother Earth herself. "Cuando Jason despierta, sabe que algo va muy mal. Está en un autobús camino de un campamento para chicos problemáticos. Y le acompañan Piper --una muchacha (bastante guapa, por cierto) que dice que es su novia y el que parece...

"Una lucha milenaria. Siete adolescentes en apuros. Y el fin del mundo a la vuelta de la esquina. El destino de la humanidad pende de un hilo: Gea, la madre Tierra, ha abierto de par en par las Puertas de la Muerte para liberar a sus despiadados monstruos. Los únicos que pueden cerrarlas son Percy, Jason, Piper, Hazel, Frank, Leo y Annabeth, el equipo de semidioses griegos y romanos elegidos por una antigua profecía. Pero su misión es todavía...

Uniting with Jason, Piper, and Leo after their dangerous quest, Percy, Hazel, and Frank wonder who will be chosen to fulfill the Prophecy of Seven, completing their group's number, and sail with them to an ancient land to find the mysterious Doors of Death.