Just an FYI, these are getting more difficult to write about because I don't want to give anything away here that will affect your experience reading of the earlier versions. I will do what I can and try to avoid being too cryptic in trying to avoid any spoilers from previous books.
The Titan's Curse is the third book from the Percy Jackson series. I loved the beginning of this book. Percy and Annabeth are on their way to a school because they have received a distress call from Grover. What I found hilarious about this is that they have to get a ride to the school and have a very typical conversation on their way. He goes into the school and makes a discovery that truly made me shocked and not really surprised at the same time. In this book, we get to meet Artemis (goddess of the hunt if your mythology is a little vague) and learn that there are other creatures besides demigods who are battling against the ancient evil forces entering the world.
This book is like the others in that the journey to solve the new complications take these characters all over the continent (and beyond). While I felt that parts of the plot of this book were a little forced, I did like that the characters developed some depth beyond the angst ridden teens who have gods for parents. We learn more about the history of some of these characters, which was helpful in wanting to complete the series. This one wasn't quite as much fun for me to read, but that being said, I still didn't want to stop, couldn't put it down and was surprised at the twists that were created. And, it segways perfectly into the fourth, which is already out, and for which I will have a book review....tomorrow.