Evalina, 17, celebrates her birthday and her high school diploma with her friends. Back home the next day, she discovers her parents murdered. Her little sister is missing. Trapped in her house, which suddenly sets on fire, she is rescued by two strange teenagers with unexpected physical abilities.
To escape the danger awaiting her, they bring her to Returis, a world she is unaware of. There, she joins the Supernatural, guardians with exceptional powers, in charge of protecting the kingdom. The Trenones, evil creatures whose nature is uncertain, prowl and threaten to destroy all life on Returis. In this strange world, Evalina sees her powers develop and become even stronger than those of the Supernatural. But will she be able to master them in time to save her sister?
In her quest to find her, Evalina is confronted by the mysterious Demona, who seems to know her well and to know her earthly friends as well. Why is she attacking her? Would everyone she cares about also be in danger?
Evalina will find herself at the heart of an ancestral war between good and evil, during which she will discover her true nature, and which will undermine all her certainties.