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.

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.

"The Greek and Roman demigods will have to cooperate in order to defeat the giants released by the Earth Mother, Gaea. Then they will have to sail together to the ancient land--Greece itself--to find the Doors of Death"--

"When mysterious incidents start wreaking havoc throughout Camp Jupiter, suspicion falls on the Fourth Cohort's newest probatio. But is she really to blame? Find out the truth by delving into the pages of her personal journal"--

If the five demigods can fight their way through the Gaea's forces, and Percy and Annabeth can survive the House of Hades, then the Seven will be able to seal the Doors of Death and prevent the giants from raising Gaea. But, Leo wonders, if the Doors are sealed, how will Percy and Annabeth be able to escape? At the conclusion of The Mark of Athena, Annabeth and Percy tumble into a pit leading straight to the Underworld. The other five demigods have...

"It's a battle of the famous strongman versus the great protector. The Roman god Hercules is known for his tremendous strength and determination. Norse god Thor is fearless and commands lighting, thunder, and storms. If these two heroes were to go head-to-head, who would come out on top? Compare and contrast Thor's and Hercules's strengths and weaknesses in this Mythology Matchup"--Provided by the publisher.