The Battle of the Labyrinth and The Last Olympian

The Battle of the Labyrinth
by Rick Riordan 

The Last Olympian
By Rick Riordan

Percy Jackson has survived carrying the titan's curse. Now he is back at the camp, walking around in the woods and enters a cave for 5 minutes. At first they do not know what it is until they come and see campers looking for them and saying they were missing for almost an hour. That's when they notice that it is an entrance to the Labyrinth. Now Percy and his friends are on a quest to find Daedalus to find out how to block the entrance of the Labyrinth from letting Kronos's forces coming in and to destroy the camp.
After the battle at the Labyrinth, Camp Half-bloods army is now ready  to face the forces of Kronos. The demigods fight a fierce battle against Kronos while the gods tries to take down the destructive monster, Typhon. The only god who could defeat Typhon is Poseidon. But  Poseidon is also fighting his own battle against Oceanus who is creating a distraction. Will the gods and the demigods survive? Who will rule the universe?