Honestly, after the second book I was seriously looking forward to continuing the series and this book didn't disappoint. It had a great adventure with the added question about how Percy really feels about Annabeth. Not only that but we see more of the gods getting involved and the story of prophecy seems to be unfolding in a quick enough pace to keep you interested. 
 This time Annabeth is the one in danger and Percy again rushes to the rescue with new companions as his heroes in arms. Thalia, the daughter of Zeus, is interesting at times but mostly seems annoying because of all the anger she holds towards a father she knows is not supposed to make contact with her. Then we had the new additions of Bianca and Nico, which we learn a surprising secret about. Last but not least is Zoe Nightshade. Her history is something of a surprise but as one of Artemis's Huntresses she is determined to find her goddess when Artemis goes missing. So we have her and her dislike for males to contend with. 
 Percy performs his heroes tasks admirably though at times you still feel like he's a about 11 years old instead of 14. Still he is maturing and I think we see a little of that towards the end of the book. 
 I think Riordan did a fantastic job and I for one plan on continuing the series.