The Battle of the Labyrinth

A New York Times Bestselling SeriesPercy Jackson and the Olympians (Book 4)Percy Jackson isn't expecting freshman orientation to be any fun. But when a mysterious mortal acquaintance appears, pursued by demon cheerleaders, things quickly move from bad to worse. Time is running out as war between the Olympians and the evil Titan lord Kronos draws near. Even the safe haven of Camp Half-Blood grows more vulnerable by the minute as Kronos's army prepares to invade its once impenetrable borders.