A couple's trip gets turned into a nightmare after a mysterious note appears under their apartment's door.
During a short visit in the German city of Hamburg, Matt and Jen must face a nightmare as they are forced to spend an extra night in the city, in what at first seems a normal apartment. Little they know that they are staying in a house of horrors until, later that night, they find a note from the apartment's owner with a very strange instruction: "Whatever you do, don't feed the neighbors."