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.

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.

Forced to work as a Siren and lure strangers to their deaths after being rescued from drowning by the Ocean, Kahlen falls in love with a human and defies the rules of her service in order to follow her heart.

Seventeen-year-old Sephora, a surfer and artist who loves fairy tales and mythology, struggles with a secret so horrible she cannot speak it aloud, especially not to her beautiful, single mother, although they have always been unusually close.

"According to Cherokee tradition, when the animals needed fire to keep them warm during cold nights, The Thunder Boys invoked a lightning bolt to strike and light fire to a lone sycamore tree. Water Spider, a tiny savior, boldly creates an ingenious way to bring fire back to the animal community" --

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

Twelve-year-old Atalanta discovers a home and friendship with a bear, misunderstanding from town-dwellers, and grudging respect from the great hunter Orion, as together they pursue mysterious creature that killed her father.

When Medusa suddenly gains the "Midas touch, " she is delighted, but as it dawns on her that it is more curse than blessing, she seeks a cure.

Emily is contending with great changes, including diminished powers, but goes to London to rescue Agent B and others from the CRU, where she makes horrible discoveries about the agency's history.

Moving to Jupiter's palace on Mount Olympus with her friends after being recognized as the Flame, Emily resolves to save her father from the CRU prison and sneaks away only to become entangled in a new invasion by the Nirads.