Percy Jackson and The Last Olympian by Rick Riordan

This was when the Great Prophecy came true.
The war between the gods and the Titans, especially the most powerful titans, Kronos - the father of Poseidon, Zeus and Hades had finally begun. All the Olympians had to fight with Typhon, the greatest monster of all time. There's only one god left, Hestia- the god of hearth, the last olympian. Only Percy can protect the Empire State Building where the Olympus stays on the 500th floor. Unfortunately, the enemy force was too big and Percy was losing more and more fighters. Just when it seemed like they are going to lose, Hades and Poseidon came to the rescue. Poseidon with his army trapped the Typhon for just a few minutes while all the other 11 gods were fighting it for days. Hades appeared with his son Nico and the whole army of the dead, slashing all the enemy. However, Kronos made a protection wall around the Empire State building and ran up to the 500th floor. Its all up to Percy, Annabeth and Grover to try and kill him.
Can they do it? Can Percy do it? Can he defeat the most powerful Titan and receive a wish that no hero was given for hundred years?