Holy SMOKES, what a cliffhanger! 
 Maybe I should mention the exciting adventure, the involved relationships between the characters, the huge apocalyptic storyline which still hasn't come to a head, even by the end of the book... but at the end of the story, you'll find the HUGEST cliffhanger EVER! I want to shake Rick Riordan's hand for providing so much enjoyment for me, and then I want to throttle him for leaving me hanging for almost a year until The House of Hades comes out. GAH!!!