>>148977213
Oh, yeah. Also: it isn't based on any singular conspiracy theory, but there's a comic adaption of the Illuminatus Trilogy. The book was based on insane schizophrenic letters the authors would receive while working at Playboy.
The book is pretty trashy IMO, but is still pretty interesting if you want a glimpse of that kind of wacky stuff.
I haven't read the comic adaption.