code: def get_book_metadata(self, asin):
      
      kbm = self._get_api_call('get_book_metadata', '"%s"' % asin)
      return KindleCloudReaderAPI._kbm_to_book(kbm)
docs: Returns a book's metadata.
  
      Args:
        asin: The ASIN of the book to be queried.
  
      Returns:
        A `KindleBook` instance corresponding to the book associated with
        `asin`.