The Last Olympian by Rick Riordan

Percy Jackson, a nearly 16 years old half-blood had come to replace Harry Potter to save the world. After killing monsters for 3 years, he meets up with the worst Titan ever, Kronos and his army. He has to defend the Empire State Building (the Olympus) and prevent western civilisation from dying. If western civilisation dies, all the gods and people in America will die. To prevent this, Percy must first prevent them from boarding into Manhattan directly by destroying their ferry, the ship which contains most of their troops and which is capable of going to Manhattan directly. Then he will have take the campers in camp half-blood to Manhattan and separate them into different groups which will defend each bridge and tunnel blocking the Titan's force from coming in. However, they only have 40 campers and they are missing the Ares campers (the god of war children), the best fighters of camp. They are mad at the Apollo campers (god of the sun) for getting the flying chariot causing them not to do anything at all . So anyway, the Ares campers will just watch their fellow friends die and the western civilisation collapsing. Also, the gods are busy trying to kill another threat, typhon so the gods wont be helping the campers. Will Percy Jackson lead the campers to victory or to their graves.

I like this book and the series very much. People may think this is like Harry Potter, well is different and in my opinion is much better than Harry Potter. I will recommend this book to who know or what to learn about Greek Myths. PS: please read this book after you finish the first 4 book of this series.