The night was already very dark. In a damp corridor, dim lights flickered, and the sound of dripping water came from somewhere. Suddenly a cry broke the gloomy silence. The sound was a little thin and a little high-pitched, a little inhumane, and one after another, it made people shudder. That was coming from the room at the end of the corridor. Who lived there, and who made such a chilling sound in the middle of the night?