As I had found out the title of the book I was seeking was Halo, I just ran a quick search for halo to see if there were other questions about this work by Tom Maddox... and found out that Halo is reserved for the Halo series of games and novels. Wouldn't it be more relevant to tag these later ones halo-series to make halo free for the tom-maddox book, should questions about it arise?
We don't have the need yet. There are currently no questions about Halo by Tom Maddox: a search for
is:q maddox halo yields 0 results.
We also don't retroactively tag story-identification requests with tags for the correct work or author.
If and when we get a question about Halo by Tom Maddox, we can decide how to tag it, and whether to retag the current halo questions.