Shadow behind my shoulder

Thirteen years ago, Olga Vorontsova faded a desire over the box: to become a famous writer. An unknown force performed a desire, but now it"s time to pay, and the payback may be worse than death. Five years ago, a man on the nickname Nub for the first time let the dark angels. They gave him supernatural power that changed his life, but he always knew that sooner or later he would be brought to him. During the summer holidays, a group of high school students climbed over the night looking into their old, now abandoned school. They do not know what they encountered there, but now something kills them one after another. Darkness will come for each. Who do employees of the Institute of Research Institute will be able to save?
Thirteen years ago, Olga laid his immortal soul, so that her desire to become a famous writer was fulfilled, and then an hour of payback approached. She herself is ready for death, but her husband, head of the group of experienced researchers Paranormal, does not want to give her beloved to the genies or demons. However, he has very little time: a couple of days left to the designated death of Olga, and you need to still deal with the mysterious deaths of adolescents who kill the invisibility in an abandoned school ... The secret dossier cycle already has a whole army of fans. The total circulation of the series is more than 100,000 books! The new mystical detective who will definitely make all the feelings, listen to the rustle behind the door and hope that the Iin team will come to your help