Annihilation

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Book 1 of the Southern Reach Trilogy.
For thirty years, Area X has remained mysterious and remote behind its intangible border - an environmental disaster zone, though to all appearances an abundant wilderness.
The Southern Reach, a secretive government agency, has sent eleven expeditions to investigate Area X. One has ended in mass suicide, another in a hail of gunfire, the eleventh in a fatal cancer epidemic.
Now four women embark on the twelfth expedition into the unknown.