Stumbled across this in my archives recently and used my sparse in-car time to listen to it over several weeks. Not quite sure what I was expecting, except I've always liked PKD. 

It was set on a future colonized Mars but written from a large absence of knowledge about psychological conditions. The premise (besides the fact that everybody is apparently schizophrenic) is that autistic individuals experience time at a different rate than the rest of us. The novel makes use of this to see into the future and ultimately, to attempt to change the past.

I can't say that I particularly enjoyed it. Gubble gubble.