Which fictional mystery would you like to be solved?

So what’s keeping Godot, anyway?

Why did Gretchen need to make ‘Fetch’ happen so badly?

Why? It’s long and boring and no one can lift the damn thing.

Who put the bomp / In the bomp bah bomp bah bomp? / Who put the ram / In the rama lama ding dong?

Who are you? Who, who, who, who?

Why do fools fall in love?

And what about Naomi?

Who killed Adena Watson.

According to the song’s lyricist, she doesn’t even know what happened.

Beat me to it! That’s what I was gonna suggest!

And (C. N. Parkinson notwithstanding) did Horatio Hornblower push Captain Sawyer down the ladder? (Well of course he did!)

What is the Venus Butterfly?

How’s Annie?

What did Aunt Ada Doom see in the woodshed?

Funny, Ijust answered that an hour ago!

Who was the queen the jester sang for?

Joan Baez? She dated Dylan.

What was Agent 99’s real name? And Penny’s family name?

I want to know what happened in Sherlock Holmes’ Adventure of the Lighthouse, the Politician, and the Trained Cormorant.

It’s one of the many “unrelated” cases that Doyle has Watson refer to. This one is mentioned in the Adventure of the Veiled Lodger, but never explained or referred to again.
No doubt there have ben pastiches of it over the years (I’m not familiar with any). I’ve composed some in my head. I doubt if Doyle ever really had anything in mind, and if he ever did try to write it later he might botch it. (The Adventure of the Second Stain was originally one of those only-referred-to cases. When Doyle actually wrote one of that title, it was a good story on its own, but inconsistent with what he had originally written).
It’s the interesting possibilities conjured up by that trio that make me curious. And what might come of it. I’m convinced that Frederick Forysyth conceived of parts of Day of the Jackal after ruminating on the untold Sherlock Holmes story of The Affair of the Aluminum Crutch.

The Mystery of Edwin Drood.

Of course.

Calvin was framed.

Here’s a list of pastiches of the Holmes mystery. It’s by no means complete – there are at least two radio play pastiches, too.

http://www.schoolandholmes.com/untoldcases.html

I came here to ask this too