Authority is the 2nd book in the Southern Reach trilogy by Jeff VanderMeer. I highly recommend reading the first book Annihilation before Authority. Otherwise it will not make much sense.
While Annihilation was told from the viewpoint of The Biologist, this book is told from the viewpoint of Control. Control is the third generation of spies in his family. He is sent to the Area X administration to assume the position of Director. His job is to find out what is wrong with the Area X explorations and fix it. First up is to interview the three members of the 12th expedition who returned, including The Biologist.
Control is challenged at each step by the Assistant Director who loyalty is to the former Director. He is also given orders by The Voice, a faceless, nameless male that he must give progress reports to daily on the phone. As Control struggles to do his assigned job, he discovers there is as much hidden in the administration of the Southern Reach as there is behind the barrier of Area X.
Bronson Pinchot does a fantastic job narrating Authority. He creates distinct voices for Control and The Voice as well as the female characters. He is one of my favorite narrators. Authority leaves the reader/listener waiting for the solution to Area X.