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  "title": "How Things Might Have Been",
  "subtitle": null,
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  "authors": [
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  "first_published": "2009-02-12",
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  "description": "Penelope Mackie's book is a novel treatment of an issue central to much current work in metaphysics: the distinction between the essential and accidental properties of individuals. Mackie's accessible discussions of issues surrounding necessity and essentialism mean that the book appeals as much to graduate students as to seasoned metaphysicians.",
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      "title": "How Things Might Have Been",
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      "pages": 228,
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