In this feature, I spotlight storylines that have been, well, left unresolved. Click here for an archive of all storylines featured so far.

Today, based on a suggestion from reader Glenn A., we look at the odd murder "mystery" of Spider-Man's first encounter with the Fly!

1976's Amazing Spider-Man Annual #10 by Len Wein, Gil Kane, Frank Giacoia and Mike Esposito (I believe Bill Mantlo is given an errant scripting credit for the issue) has Spider-Man foil a hostage-taker, who seemingly plunges to his death...

Meanwhile, J. Jonah Jameson was being his typical jerky self, trying to get another scientist to create a superhuman to take down Spider-Man...

The scientist was interrupted by the aforementioned hostage-taker, whose life is saved by becoming the Fly...

So Jameson comes by later and finds out that the scientist has been murdered...

The Fly then kidnaps Jameson and goes by the Daily Bugle to arrange a rematch with Spider-Man...

Spider-Man shows up to save Jameson, and overhears that the Fly is apparently a killer...

Go to the next page to see how Spider-Man makes a bold claim that is still unresolved, even though Marvel offered a No-Prize to anyone who solved it!

So Spider-Man goes at the Fly, and tells him he's taking him in for the murder of the scientist...

Sooo...yeah, how does Spider-Man even KNOW that Stilwell was dead, let alone that the Fly murdered him?

And really, Fly, as strong as Spider-Man? That's a bold claim!

Spidey then kicks his ass for having the temerity to claim that he is in Spidey's territory, strength-wise...

Marvel never revealed any No-Prize winners. I sort of suspect that it was just a legit plot mistake that they decided to cover up by offering up a No-Prize to anyone who could figure out an excuse for their mistake. But maybe I'm wrong - can anyone out there solve it? I've given you seriously ALL of the clues.

Thanks for the suggestion, Glenn! If anyone else has a suggestion for an unresolved comic book plot, drop me a line at bcronin@comicbookresources.com