You should modify this fragment:
// Define the query
$args = array(
'post_type' => 'fiction',
'booktype' => $term->slug,
'orderby' => 'name',
'order' => 'ASC'
);
You should modify this fragment:
// Define the query
$args = array(
'post_type' => 'fiction',
'booktype' => $term->slug,
'orderby' => 'name',
'order' => 'ASC'
);