An unexplained blackout plunges the city of Detroit into total darkness, and by the time the sun rises, only a few people remain -- surrounded by heaps of empty clothing, abandoned cars and lengthening shadows. A small handful of strangers that have survived the night each find their way to a rundown bar, whose gasoline-powered generator and stockpile of food and drink make it the last refuge in a deserted city. With daylight beginning to disappear completely and whispering shadows surrounding the survivors, they soon discover that the enemy is the darkness itself, and only the few remaining light sources can keep them safe. As time begins to run out for them, darkness closes in and they must face the ultimate terror.