Whisperworld [Audiobook]

The Wrath of God destroyed the old world, and what's left of humanity huddles in the shadows of the Tears, strange black spheres that protect the last cities from the storms. No one knows what they are or how they work, but if you listen, you can hear them whispering.... But now the spheres are failing, falling silent.
When one of the Gardeners who protect and maintain the Tears is murdered, Julia and her partner, Zach, are summoned to find out why. Their search for a killer will take them from Angel City's crumbling skyscrapers to the salt flats of the Pacific Desert.
But what they find goes far beyond murder, threatening to wipe out the last remnants of civilization. Perhaps they can save their city - but first they have to save themselves.