The Book (n.) is called immoral by the world when it is a book that shows the world its own shame.
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A Book (n.) is not a thing that can be either moral or immoral. There's no such thing. Books are well written, or badly written. That is all.
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The Book (n.) is amoral — there is no such thing as a moral or an immoral book.
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A Book (n.) cannot poison anyone; there is no such thing as being poisoned by a book.
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A Book (n.) can be judged worth anything or worth nothing in half an hour. Ten minutes are really sufficient, if one has the instinct for form.