Someone is secretly and closely interested in the lives of four children crippled by their mother. One murder, a second, a third... And all of them, one way or another, are connected with this unfortunate family. What secret is hidden in the past of these people? Is it in the past? - Nastya Kamenskaya doubts, analyzing the circumstances of the crimes. As always, there is no time to think - a girl was kidnapped straight from the hospital, and the threat loomed over the rest of the children. Where is the source of this threat? Insight, like a flash of lightning, suddenly illuminates the whole situation, which turns out to be much worse than Nastya thought...