single-book.php should not have a custom query in it. WordPress has already queried the correct post, so new WP_Query( $args ) is completely unnecessary.
Your problem is that you’re missing the loop.
At the bare minimum single-book.php should have:
<?php while ( have_posts() ) : the_post(); ?>
<h1><?php the_title(); ?></h1>
<?php the_content(); ?>
<?php endwhile; ?>
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