So for those of you who don't know The Mark of Athena is the 3rd book in the Heroes of Olympus series which continues the Percy Jackson series another series of books by Rich Riordan. Anyway I about 1/3 of the way through and it is really cool it is everything i would expect from a this series. This book is funny, action packed, mysterious, and really suspenseful.
In this books there are 7 main characters; Percy, Jason, Annabeth, Piper, Leo, Frank, and Hazel. They are on a quest to find the Mark of Athena that will hopefully help unite the citizens of New Rome (Camp Jupiter/a.k.a Romans) and Camp Half-Blood (a.k.a the Greeks) who have been fighting for centuries. It is a race against time because Gaea and her evil forces are working to destroy the world .
That is as much as I can tell you without putting in any spoilers. My advice to you if you haven't read the past book and read the first book in the Percy Jackson series. I hope you think its as good as i do.