Just noticed that a few more Dean Koontz novels are down to 99p in the UK after the mass price reductions a few months back. They sound like the usual 80% supernatural, 20% science fiction mix from the synopses.
Demon Seed should be a proper SF novel, but it was apparently completely re-written in the 1990s so may not be the novel it once was.
Fear Nothing (Moonlight Bay Trilogy #1)
Demon Seed
Strange Highways
The Door to December
The Dean Koontz Collection- By the Light of the Moon
- One Door Away from Heaven
- Seize the Night (Moonlight Bay Trilogy #2)
Be aware that you'll need access to some kind of dimensional portal to get the final book in the Moonlight Bay trilogy...