Faced with the consequences of a devastating loss, Amelia Scott is completely immersed in a world of teenage rebellion. Endless parties, dubious companies, a new, unusual way of life - all this ultimately leads her to Granhall - an experimental rehabilitation center for troubled teenagers. At first glance, everything in it exists to help those in need. But gradually Amelia reveals the terrible truth. Many Granhall patients get a one-way ticket here. Having crossed the middle line, Amelia's neighbor disappears right from her room in the middle of the night. And then she herself feels how the same mortal danger hangs over her. Now the girl has to find out what role the provincial town plays in someone’s grandiose and very dangerous plans, who is making sure that the number of patients is steadily growing, and where do the others disappear without a trace? But how can you get answers to these questions if your whole life is now behind glass?