"The Greek and Roman demigods must simultaneously prevent the earth mother, Gaea, from waking and stop war from breaking out at Camp Half-Blood"--

After angering his father, Zeus, the god Apollo is cast down from Olympus. Now a weak and disoriented teenage boy in New York City, the four-thousand-year-old deity can think of only one place to go... an enclave of modern demigods known as Camp Half-Blood.

When shy sixteen-year-old Helen Hamilton starts having vivid dreams about three ancient, hideous women and suddenly tries to kill a new student at her Nantucket high school, she discovers that she is playing out some version of an old tale involving Helen of Troy, the Three Furies, and a mythic battle.

The Heroes in Training are entering the Underworld-if Hades can conquer his canine fears, that is. The Underworld usually isn't really meant to be a fun place-but tell that to Hades! He loves the dark and the stinky smell of sulfur. However, there is one thing that Hades is not a fan of: dogs. And when Zeus and his fellow Olympians encounter Cerberus-a snarling, three-headed dog-Hades must conquer his fears and tame the hound so everyone can continue...

"Who cut off Medusa's head? Who was raised by a she-bear? Who tamed Pegasus? It takes a demigod to know, and Percy Jackson can fill you in on the all the daring deeds of Perseus, Atalanta, Bellerophon, and the rest of the major Greek heroes. Told in the funny, irreverent style readers have come to expect from Percy --

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.

"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 to put aside their grief and follow Percy's instructions to find the mortal side of the Doors of Death. If they 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 from both sides and prevent the giants from raising...

With help from her new friend Orion, seventeen-year-old Helen Hamilton descends into the Underworld in search of a way to break the Furies' blood curse and prevent the start of another Trojan War.

Zeus, a tiny hamster who believes he is the king of the gods, must find the legendary "Golden Fleas" and solidify his position before the other animals at Mount Olympus Pet Center rebel.

After a summer spent trying to prevent a catastrophic war among the Greek gods, Percy Jackson is finding seventh grade unnervingly quiet. His biggest problem is dealing with his new friend, Tyson, a six-foot-three, mentally challenged homeless kid who follows Percy everywhere. But things don't stay quiet for long. Percy soon discovers that there is trouble at Camp Half-Blood: the magical borders that protect Half-Blood Hill have been poisoned, and...