The Mercy Falls Children's Hospital is about to close its doors for good after one Century of service. But the closing process is taking longer than expected; a railroad accident has left the local hospitals without beds. It will take a few more days to transfer all the children. It will not be an easy task. Most of the personnel has left and practically all the installations have already been dismantled. Amy, a young nurse, is sent from London to help out. But she soon detects something odd in this place... The children are nervous. And afraid. Of something intangible, invisible. Something that shouldn't even exist. Someting full of pain. And hatred. Some of them call it "the mechanical girl". And they claim it lives upstairs, on the third floor. The floor that has been closed and blocked away from the rest of the building for 40 years...