The Battle of the Labyrinth (Percy Jackson and the Olympians 4)

In this fourth adventure in the #1 «New York Times»-bestselling series, time is running out as war between the Olympians and the evil Titan lord Kronos draws near. To stop them, Percy and his demigod friends must set out on a quest through the Labyrinth — a sprawling underground world with stunning surprises at every turn.