Here's a breakdown:
* Kronos's Resurgence: Kronos is attempting to regain his power and overthrow the Olympians. He has been slowly building his army of monsters and gathering power through various schemes.
* The Prophecy of the Titan's Curse: This prophecy foretells the downfall of Olympus, but it also hints at a hero who can stop Kronos. The prophecy fuels the tension and fear throughout the book.
* The Search for the Missing Hunters: The Titan's Curse focuses on the search for the missing Hunters of Artemis, who have been kidnapped by Kronos. The rescue mission becomes crucial as the hunters are vital to Artemis's power and the fate of Olympus.
* The Battle for Olympus: The climax of the book involves a massive battle between the heroes and Kronos's army. The fate of Olympus and the world hangs in the balance.
Therefore, the central problem is not just the immediate threat of Kronos and his monsters, but also the prospect of his eventual triumph and the devastating consequences for the world. The story centers on the heroes' struggle to prevent this outcome and ultimately defeat Kronos.