Nerves.

Three city planners end up in a place forgotten by the outside world. After being attacked by a madman with a hedge trimmer, Jan flees into one of the houses. Corpses, ominous inventory and eerie noises pose all sorts of puzzles. Strange figures in front of the door prevent him from escaping. The distraught man stumbles from one bloody deed to the next and soon no longer knows what illusion and reality are...