 A department store photo clerk, Seymour  Sy  Parrish, is exceptionally knowledgeable about photography, and has been developing photos for the Yorkin family since their son was a baby. However, Sy also lives a very solitary and lonely life - with no wife, girlfriend, or family in the picture. Sy begins to develop a disturbing obsession with the Yorkins and what they have, and when he is fired for theft he goes over the top. Having discovered a disturbing secret about Mr. Yorkin, he exacts angry revenge in a chilling manner...