Fan-fiction of Percy Jackson! this book is in-between 'Battle of the Labyrinth' and 'Last Olympian'. There are some new characters but mostly all of them are the same! The main Character is a 13 year old girl named Ally, she's Percy Jackson's sister, she also has a twin sister named May. They go on a big journey to try and prevent the Titan War.! I hope you like it! (BTW: I'm kind of new at this) ^^