I read a lot of PKD when I was in my 20's. It all started with Ubik. Then Androids. A Scanner Darkly. And about 10 other novels. The early Total Recall is one of the better movie adaptations wrt covering the core concepts of the story. Waves and Waves of revelations about the nature of reality. Minority Report, not so much. And of course, Blade Runner is tangentially related to the book. (It's a masterpiece, but it's not Androids)
Once I started getting into the short stories, I started getting pretty paranoid. There's one theme that repeats throughout that reality is not your perception of it, to your eventual downfall. Repeated over and over, across post apocalyptic wastelands, it leads to a somewhat bleak view of the future. (One in particular, I think it's The Fifth Variety, seems to be tailor made to describe computer security from here on out. Spoiler: _Everything_ is a trojan)
I think you mean Second Variety [1], which is really great in my opinion as well. It, like many of PKD's works, was also made into a movie (Screamers).
Second Variety is freely available [2] on the Internet Archive, via Project Gutenberg.
Once I started getting into the short stories, I started getting pretty paranoid. There's one theme that repeats throughout that reality is not your perception of it, to your eventual downfall. Repeated over and over, across post apocalyptic wastelands, it leads to a somewhat bleak view of the future. (One in particular, I think it's The Fifth Variety, seems to be tailor made to describe computer security from here on out. Spoiler: _Everything_ is a trojan)