Recs if you like Criminal Minds: Sociopaths, Serial Killers, and Other Deviants...

how to get access to many books by reading one book (series)

aka. books with the most works on ao3 about them (fandoms with 10k+ works, in no particular order) (sometimes the fanfics may be about a movie adaptation rather than the specific book but still fits in the overall fandom)

Books/Graphic Novels that were written to tie into TV Shows/Movies/Games

Work in progress Open to suggestions!