The Sky Above by A.G.R. Goff

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In the year 2021, a religious civil war rocks the world, destroying civilisation and pitting Muslims against Christians. Fear rules as looters and rapists control the streets, and people are killed for nothing more than the colour of their skin. Those who survive are left to starve to death or die from lack of clean water.
Brought together by the cruellest of fates, two schoolmates, Mark and Ben—one Christian, one Muslim—band together in a desperate quest for survival. Not knowing whom to trust or what the future holds for them, or humankind, they try to stay alive while caring for Ben’s little sister, until a chance encounter changes everything.

“…after reading the blurb I was excited to read the book. The author has done a great job…” Amazon reviewer