Percy is confused. When he awoke from his long sleep, he didn't know much more than his name. His brain fuzz is lingering, even after the wolf Lupa told him he is a demigod and trained him to fight with the pen/sword in his pocket. Somehow Percy manages to make it to a camp for half-bloods, despite the fact that he has to keep killing monsters along the way. But the camp doesn't ring any bells with him. The only thing he can recall from his past is...

"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"--

"Odin, the ruler of the Asgardians, has an important mission for Demon. Goldbristle, the gods' prized shining boar, is losing his light. Now Demon must travel to Asgard in the North to search this cold, snowy land for anything that might cure this beast." -back of cover.

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. 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...