Percy Jackson and the Olympians, Book 3.

When Percy Jackson receives a desperate call for help from his satyr friend Grover, he doesnt hesitate. Armed with his celestial bronze sword and joined by his fellow demigods, Percy rushes into danger.

Grover has discovered two powerful new demigods whose godly parentage remains a mystery. But before Percy and his friends can protect them, theyre caught in a deadly ambushpart of a cunning plan by the Titan lord Kronos, who is growing stronger with each passing day.

As the young heroes battle monsters, betrayal and the icy grip of an ancient curse, a dark prophecy begins to unfoldone that hints at sacrifice, shattered alliances, and the rise of a power even Olympus may not survive.