I deserve to be downvoted by the literature snobs, but if you liked Blade Runner the movie (and who in their right mind doesn't?), then you may very well enjoy K. W. Jeter's three written sequels to the MOVIE Blade Runner (not the BOOK DADOES), "Blade Runner 2: The Edge of Human", "Blade Runner 3: Replicant Night", and "Blade Runner 4: Eye and Talon". There is no book "Blade Runner 1" -- that's the movie.
The irony is that Philip K Dick was offered a whole lot of money to write another book entitled "Blade Runner" based on the screenplay of the movie, but he insisted on maintaining the integrity and title of his original book DADOES by re-issuing it with a reference to the (quite different) movie on the cover, instead of rewriting another book called "Blade Runner" based on the movie based on his own book. (Harrumph!) He would have made a lot more money by selling out that way, but he steadfastly refused to do it.
However, fortunately for us, after his death, his friend and fellow SF writer K. W. Jeter (who also wrote an excellent cyberpunk novel Dr. Adder which Dick loved) sold out on his behalf and wrote those three books based on the movie (which referenced famous lines like "Wake up. Time to die!").
They explore the question of what the fuck happened after they went flying off into the wilderness (that unused footage from The Shining), and whether Decker was a replicant. (Who would have guessed??!)
So even though they're not written by PKD, or directly based on his original all time great book, and not as authentic and mentally twisted as a real PKD book, they are still pretty excellent and twisted in their own right, and well worth reading. They're based on an excellent movie based on an epic book, and written by a friend and author PKD respected, who's written some other excellent books.
And while you're at it, check out Dr. Adder and K. W. Jeter's other books too! Especially Noire, for its hi-fi cables made out of the still-living spinal columns of copyright violators. (I suggest you buy a copy and don't pirate it!)
Jeter's most significant sf may lie in the thematic trilogy comprising Dr Adder (1984) – his first novel (written 1972), long left unpublished because of its sometimes turgid violence – The Glass Hammer (1985) and Death Arms (1987); Alligator Alley (1989) as by Dr Adder with Mink Mole (see Ferret) is a distant outrider to the sequence. Philip K Dick had read Dr Adder in manuscript and for years advocated it; and it is clear why. Though the novel clearly prefigures the under-soil airlessness of the best urban Cyberpunk, it even more clearly serves as a bridge between the defiant reality-testing Paranoia of Dick's characters and the doomed realpolitiking of the surrendered souls who dwell in post-1984 urban sprawls (see Cities). In each of these convoluted tales, set in a devastated Somme-like Near-Future America, Jeter's characters seem to vacillate between the sf traditions of resistance and cyberpunk quietism. In worlds like these, the intermittent flashes of sf imagery or content are unlasting consolations.
[...]
Much of his later work has consisted of Sharecrop contributions to various proprietorial worlds, including Alien Nation, Star Trek, Star Wars [for titles see Checklist]; of some interest in this output are his Ties – they are also in a sense Sequels by Another Hand – to the film Blade Runner (1982), comprising Blade Runner 2: The Edge of Human (1995), Blade Runner 3: Replicant Night (1996) and Blade Runner 4: Eye & Talon (2000), and making use of some original Philip K Dick material. The sense of ebbing enthusiasm generated by these various Ties is not markedly altered by Jeter's most recent singleton, Noir (1998), a Cyberpunk novel whose detective protagonist's main job is killing copyright violators so that their still-living spinal cords may be incorporated into hi-fi system cables; the irreality of this concept, and the bad-joke names that proliferate throughout, are somewhat stiffened up by the constant interactive presence of the already dead, a Philip K Dick effect, as filtered through Jeter's own intensely florid sensibility. [JC]
If you want another sci-fi detective noir, Altered Carbon fits the bill.