When the goddess Artemis disappears while hunting a rare, ancient monster, a group of her followers joins Percy and his friends in an attempt to find and rescue her before the winter solstice, when her influence is needed to sway the Olympian Council regarding the war with the Titans.

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.

Phew, it's hot! Under the titan Hyperion's rule, the sun is burning even brighter than normal and scorching everything in northern Greece, including the villagers! The Olympians are forced to play a sizzling "game" of Dodge the Sunbursts as Hyperion hurls giant fireballs that could fry them to pieces! Armed with some clues, Zeus, Poseidon, and Hades set out to figure out why in the world Hyperion has been making things so hot. They also need to rescue...

"Los mestizos han dedicado mucho tiempo a prepararse para la batalla decisiva contra los titanes, aunque saben que sus posibilidades de obtener la victoria son mínimas. El ejército de Cronos es ahora más formidable que nunca y, con cada dios y cada mestizo que logra reclutar, aumentan los poderes del maligno titán. Tras fracasa en un primer intento de detener en alta mar las arrolladoras huestes de Cronos, Perscy Jackson y los olímpicos se esfuerzan...