The story is loosely based on the novel "Do Androids Dream of Electric Sheep?" which was written by Philip K. Dick. The screenplay of the film was written by Hampton Fancher and David Peoples.
The story of the film revolves around a dystopian Los Angeles in November 2019. Tyrell Corporation is a very powerful manufacturing company which produces genetically engineered organic robots called Replicants which happen to be visually indistinguishable from adult normal human beings.
There are some other mega corporations around the world and they also produce such robots.
Quick Guide: Blade Runner
Copyright
Chapter One: Introduction
Chapter Two: Plot Summary
Chapter Three: Characters
Chapter Four: Complete Summary
Chapter Five: Response and Reception