When best friends Piper, Jason, and Leo find out that they're the demigod children of Greek gods, they experience a mix of emotions, very few positive. By the time they arrive at camp half-blood, the safe haven for Greek demigods, they realize some things are very wrong. Not one day after learning their heritage, the three demigods, still full of fear, confusion, and anger, are thrust into a quest to save the world before the winter solstice----four days away.