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The book "The Shack" is categorized as fiction yet, isn't it based on a factual account of a serial killer? In trying to understand the difference between fiction and non-fiction, the book "The Shack" is categorized as fiction yet, isn't it based on factual accounts of a Serial Killer?

wanna visit Russia, planed to visit whole the country from Murmansk to Vladivostok and from Anadyr to Kaliningerad, need to know which cities are no go for foreigners.