This, of course, was the basis for the wonderful Blade Runner movie. The movie is faithful to the tone of the book, and to many of the details. I wish that both had concentrated a bit more on the moral issues that might arise when there are manufactured people who are nearly indistinguishable from humans. The book deals with those issues more directly, but not to my satisfaction. Dick's prose is uncomplicated and straightforward — his main strength seems to lie in the creation of morally interesting plot elements.