4 demigods, each gifted with one of the 4 elements. Best friends, no doubt. When these four demigods encounter Camp Half-Blood, they meet the Seven Demigods, the famous 7 who defeated Gaea. Things start to get tricky. The four demigods and their new friends and enemies wonder how they can get through the mess their arrival has created. And they must solve and fight a prophecy made years ago.