When Percy Jackson discovered that he was a demigod, son of Poseidon and a mortal, his life changed forever. With his companions, Annabeth and Grover, he completed risky missions: he found out who had stolen Zeus's lightning bolt, brought the Golden Fleece to Camp Half-Blood, freed the captive goddess Artemis, and determined the outcome of the great Battle of the Labyrinth.
But now the time of judgment has come...

"I'm telling you this to avoid any misunderstanding:
I didn't want to be a demigod.
If you're reading this book just because you think you might be one too,
then here's my advice:
close the book immediately!
Don't say I didn't warn you.
My name is Percy Jackson..."

The time for the final showdown has come. All year, the demigods have been preparing to clash, alongside the Olympians, with the formidable forces of Kronos and the Titans, in a battle that seems uneven. While the Olympians struggle to hold back the destructive Typhon, Kronos begins his advance with the aim of reaching Olympus, which is essentially unguarded. During this epic battle, many secrets will unfold, such as the terrifying prophecy linked to Percy’s sixteenth birthday. And a key role will be played by the unseen Last Olympian, or perhaps the last goddess of Olympus...

Percy Jackson and his demigod companions fight against the Lord of Time to save Olympus and the world. They must win. Will they succeed?