Seven hidden souls. Kalinina N.D.

Seven children, pupils of the boarding school, go to the closed wing of the old estate to help out the dog that has fallen into trouble. But a good deed turns into a tragedy: one of the girls is found dead.

fifteen years have passed, and the life of Ada, one of the seven pupils, turns into a nightmare. Her former comrades die one by one. The danger threatens the girl herself. To be saved, she has to figure out the past and understand what is happening in the present...