A downed plane full of passengers is halved by two realms, one that looks a lot like the hot, dry desert of the southwest, and one that doesn't, where the flora is blue trees with curly leaves and the fauna is something no one on board has ever seen, but which has obviously seen humans before and is determined to begin taking their pick of the survivors.
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Used availability for S K Epperson's The Rift
January 2017 : Paperback
July 2011 : USA, Canada, UK Kindle edition