While the Olympians struggle to contain the rampaging monster Typhon, Kronos begins his advance on New York City, where Mount Olympus stands virtually unguarded. Now it's up to Percy Jackson and an army of young demigods to stop the Lord of Time.

When demonic cheerleaders invade his high school, Percy Jackson hurries to Camp Half Blood, from whence he and his demigod friends set out on a quest through the Labyrinth, while the war between the Olympians and the evil Titan lord Kronos draws near.

"The otherworldly Karou struggles to come to terms with who and what she is, and how far she'll go to avenge her people"--

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.

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?

"Seventeen-year-old Pierce Oliviera knew by accepting the love of John Hayden, she'd be forced to live forever in the Underworld. But now her happiness and safety are threatened because the Furies have discovered that John has broken one of their strictest rules, and the only way to fix the balance is for someone to die"--

After learning that he is the son of a mortal woman and Poseidon, god of the sea, twelve-year-old Percy is sent to a summer camp for demigods like himself, and joins his new friends on a quest to prevent a war between the gods.

"Trojan princess Cassandra is cursed by Apollo with the gift of prophecy, and must try to find her place in a world that she knows to be perilous; years later, will her friendship with a young Amazon princess named Rin help her to avert a disastrous end to their war?"--

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.

Leaving the safety of the demigod training ground, a disgraced Apollo embarks on a quest across North America to find a dangerous ancient-world Oracle while navigating the challenges of the evil Triumvirate.