City. The high-rise building is one of them. And it contains standard, completely identical apartments, the same as in the neighboring house. To the right and to the left, on all sides, someone also lives. Just like you go to school or to work. Sometimes you meet on the landing or in the elevator. Sometimes you even say hello. But what do you know about your neighbors? You wake up in the silence of the night and hear how the house lives. Breathing. Vibrations, rustles and sounds whose nature you cannot explain. And you are separated from these sounds by only a thin brick partition. What's behind it?