Percy Jackson's hope for a normal senior year is shattered as the gods present him with three quests--beginning with the retrieval of Zeus's goblet--in order to get the necessary three letters of recommendation for college.

Reborn as the Flame, thirteen-year-old Emily has saved Olympus from destruction but when the gruesome Nirads begin a new invasion, Emily and her friends become entangled in the conflict as old grudges are unearthed and new enemies are discovered.

Percy Jackson, who has completed a perilous quest with the young Roman demigods of Camp Jupiter, is about to reunite with Annabeth and the Greek demigods of Camp Half-Blood, and the two groups must cooperate in order to defeat the giants released by the Earth Mother, Gaia. Then, to fulfill the Great Prophecy, seven will have to sail together to the ancient land to find the Doors of Death.

Uniting with Jason, Piper, and Leo after their dangerous quest, Percy, Hazel, and Frank wonder who'll 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.

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.