Annihilation calls itself a fantasy novel, although I found it to be more a a distopian science-fiction setting. However due to the style its written, and the set-up for the other two books in the trilogy, its hard to be certain what directino the books will go in.
It is written as a journal of the protaganist, who is nameless (along with all other characters) and the journal is dateless. She has been sent into this mysterious “Zone X” to discover what the disaster was, following extensive training and careful selection. The journal format also allows for a great deal of introspection, and I enjoyed the lack of clarity and gradual reveal as she made discoveries about the nature of the place.
I’m reluctant to say more as this book is one that has to be experienced, but will definitely be putting book two on order.