The Doka is the space used by Polaroid to place new (instant) films in the cassettes. As these films are very sensitive to light, this process must be carried out in the dark. The only light that does not harm the photos is infra-red light.
There is something sinister in this darkness. A crook with evil plans is wandering around. The participants must find the light in the darkness, and find their way out by using technology and common sense.