A stars of Avalon book

What would you do if you found out that your whole childhood was a lie?

An unknown murderer is threatening to corrupt the existence of humanity as we know it. A series of gruesome murders have rocked the city, shaking its residents to their very core. With the fate of the world resting on their shoulders. Jules and her twin sister Sophia must fight unknown forces using their new found powers to help protect humanity from an ancient threat. And restore the balance of the realms.