The [book] shortcode it used to display book information for a specific book.
id- ID number of the book to display. Required.
rating- Star rating. Optional.
Display book information for book #2:
Because the rating has been omitted, no rating will appear in the book information.
Here's an example of the same book but with a rating:
[book id="2" rating="5"]
How do I find the ID number of a book?
Go to your Book Library page and locate your desired book in the table. Hover over the title, and you'll see a few links appear along with "ID:" followed by a number. That number is the ID.