A broken promise is all it takes. Becoming an E.K isn't a choice for Serena - it's a necessity to survive. To destroy the Elementals she has to leave her old life behind. She has to train and follow a strict regime. But with time against her, she has only a few weeks to master the skills Kai spent his whole life perfecting.The knowledge passed down from her ancestors is crucial to the Elementals' demise and the success of their mission. However, the path they must follow is lined with riddles, each more confusing than the next. It doesn't matter how close to succeeding they get, it's never enough. The Elementals are one step ahead at every revelation and that can only mean one thing - the E.Ks have a traitor among them.