Whizbang Dustyboots
Gnometown Hero
The later books really deepen the setting in, to me, really compelling ways, while continually making sure to add on more weirdness and mystery (rather than solving it all, which too many series do, IMO). I love the movie but I think the Area X novels as a whole are better. But both are fantastic.I read the Annihilation book, and watched the movie back to back.
Might be the unusual case where a movie is as good or better than the book.

