Annihilation (The Southern Reach Trilogy) by Jeff VanderMeer.

I'll say it up front - you will either love or hate this book. You'll either read the first 20 pages with a growing sense of frustration and toss it - or you'll read the first twenty pages with a growing sense of frustration and not put it down until it's finished.
I'm in the second group.
Jeff VanderMeer has a weird style and approach to telling a story that I find absolutely hypnotic. Without handing you much, he has the ability to conjure up the most amazing images and symbols in your mind's eye and invoke eerie moods in your subconscious. Like his earlier works
City of Saints and Madmen,
Finch, and the (sadly out-of-print)
Shriek: An Afterword,
Annihilation continues in the same tradition - but in a new storyline which doesn't take place in his brooding city named Ambergris. Pretty neat feat for someone using only the printed word.
So here's the deal:
Area X has been cut off from the rest of the continent for decades. Nature has reclaimed the last vestiges of human civilization. The first expedition returned with reports of a pristine, Edenic landscape; the second expedition ended in mass suicide, the third expedition in a hail of gunfire as its members turned on one another. The members of the eleventh expedition returned as shadows of their former selves, and within weeks, all had died of cancer. In Annihilation, the first volume of Jeff VanderMeer's Southern Reach trilogy, we join the twelfth expedition.
The group is made up of four women: an anthropologist; a surveyor; a psychologist, the de facto leader; and our narrator, a biologist. Their mission is to map the terrain, record all observations of their surroundings and of one another, and, above all, avoid being contaminated by Area X itself.
They arrive expecting the unexpected, and Area X delivers—they discover a massive topographic anomaly and life forms that surpass understanding—but it’s the surprises that came across the border with them and the secrets the expedition members are keeping from one another that change everything.
Not for everyone. But, as the saying goes, "If you like this sort of book, this is a book you'll like."
Amazon's page has an extensive sampling of the first part of the book. Or you can read an excerpt of the first few pages
here. I'd suggest you check them out first before buying it.
One review I saw that IMO nailed what this book is about can be found
here.
Recommended -
but with caveat. 
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Note: if anybody has a copy of
Shriek: An Afterword (either paperback or hardcover) they'd be interested in selling, please PM me? I need a second copy for a project I'm working on. Thx.
