Cursed Blade

Camp Half-Blood is the only safe place for demigods, because of the barrier that keeps out monsters. But the camp has been invaded by monsters and that can only mean one thing; the barrier has been broken. But what could break it? The only thing that could break it is the sword that can break anything, the cursed blade. Alyssa, Tiffany, and Bailey have to sneak away on a quest to find it. But will they find it before the criminal master-mind can destroy Olympus, and the Gods chairs of power?