This is the end of The Heroes of Olympus series. I am terrible at reviewing series so I'm not even going to really try. I liked this series, I didn't like it as much as Percy Jackson and the Olympians but I liked the variety of characters in this series. I loved the ending. 
 I don't know if I'll pick up any more Rick Riordan, has anyone read any of his other stuff? Are there any that I should pick up? 
 Audiobook note: Nick Chamain, the narrator for this book is so slow that listening to it at 1.5 sounded normal.