Thirteen years ago, Olga Vorontsova made a wish over a small casket: to become a famous writer. An unknown force granted the wish—but now it’s time to pay, and the price may turn out to be worse than death. Five years ago, a man nicknamed Nev first let the Dark Angels into himself. They gave him supernatural power that changed his life, but he always knew that sooner or later the bill would come due.
During summer vacation, a group of high school students sneaked into their old, now abandoned school after dark. They don’t know what they encountered there—but now something kills them one by one. Darkness will come for everyone. Who will the staff of the Institute for the Study of the Unexplained be able to save?