The eponymous Mark is a homeless crack addict who lives in the parks of Teheran by day and steals from donation boxes (these stand on nearly every street corner) by night. Fate has pushed the once father, husband and successful resident of the United States to the margin of society and has turned him into an outcast. The film shows one night in Marks life and provides insight into the secrets of the city. The films powerful images and personal narration brings the viewer close to the experience of a man whom fate has trapped in a social role inflicted by fate, but who is, nonetheless, aware of his position and of the painful reality that surrounds him.