You should have already followed the Creating a custom post type recipe to have a starting point for this recipe, and the resulting plugin should still be active in your development site. Alternatively, you can get the resulting code (Chapter 4/ch4-book-reviews/ch4-book-reviews-v1.php) from the code bundle downloaded from the Packt website (https://www.packtpub.com/support) and rename the file ch4-book-reviews.php.