Saving meta_box checkbox

I’ve created some custom meta_box text fields that work fine. They display and save. I’m trying to create one check box meta_box that isn’t working for me.

<?php
function admin_init() {
   add_meta_box("event_novel", "Novel Type", "novel", "events", "normal", "high");
}
function novel(){
  global $post;
  $custom = get_post_custom($post->ID);
  $novel = $custom["novel"][0];
  ?>
  <input type="checkbox" name="novel" value="<?php echo $novel; ?>" />  This is a novel.
<?php } ?>

<?php
function save_details(){
   if ( defined('DOING_AUTOSAVE') && DOING_AUTOSAVE )
   return $post_id;
   global $post;
   update_post_meta($post->ID, "novel", $_POST["novel"]);
} ?>

This displays the checkbox, but it doesn’t save. What do I need to do to check if that checkbox is saved and then display it checked (if it’s saved)? Furthermore, how do I later call to that value (if it’s checked) in the loop later on.