AnotherGuy
Hero
To me, the relevance of prep is really about why, and what for? Apocalypse World is very clear about this: prep is done between sessions, so that there is time to think it through and write it up; and the purpose of prep is to give the GM interesting things to say (soft moves and hard moves) - I had a back-and-forth upthread about this with @EzekielRaiden. (See post 1740, and the posts that precede that via quoting.)
These are great focused uses of prep for games with specific styles of play. I definitely appreciate these unique approaches.In Prince Valiant - the system in which I ran "The Blue Cloak", a fairly simple mystery that I posted about upthread - preparation is generally about coming up with a scene or situation. Because the default PC in Prince Valiant is a knight errant, all a situation needs is a hook for that errantry: and that's what a good Prince Valiant episode provides.
Many posters in this thread may use prep to actually flesh out the mystery before play begins which is similar to picking up an AP/module. The adventure/mystery exists whether we've run it or not.
Now one of the definitions of the word objective which I found is
(a) in a way that is based on facts and not influenced by personal beliefs or feelings
I'm personally NOT using it this way.
Another is
(b) in a way that is not dependent on the mind for existence; actually
This is the way I'm applying it.
So going back to the top part of your post!
If there is something prepared - GM's notes, a module, etc - then there is an artefact (a document or collection of documents/papers) that exists.
There is also, perhaps, a plan that exists (as an abstract object). That might depend on the nature of the prep.
But there is no shared fiction until play actually takes place. And I don't think a bit of shared fiction is less "objective" because it is settled on now rather than is the result of a plan that was made then.
The mystery of the missing Earl is indeed a mystery but the facts of why he is missing have not yet been formulated until such time that they do. So almost anything goes as to the reason until it becomes established, then I'd say it is objective.
Whereas say a GM who has prepped that same adventure and has a definitive reason of why that Earl is missing, the mystery is not dependent on the mind (per the definition I'm using).
Now interestingly sandwiched between your style and the fully prepped style you could throw in 5e's Murder in Baldur's Gate which the secondary bad guy can be 1 of 4 people.
Bhaal, the BBEG, is selecting a host and the individual that is responsible for the most death (translated to murders, since he is the God of Murder), that is the person who's body gets taken over by Bhaal. 3 persons of interest provided for in the adventure itself and then the fourth being a PC. The PCs find themselves choosing which maddening events to stop in the city thus unknowingly directing which person gets the most kills. And the adventure provides the option for a PC being the most destructive. Really smart and fun adventure. 

All three ARE mysteries, all three NEED to be solved, but they BECOME (for me) objective mysteries (i.e. the truths/facts are settled) when they have a definitive answer in play or when they have been mapped out (often via prep before play).
Anyways, I'm keen to try your style with my group - I seem to believe it may work better (or should I say feel easier to handle) with some genres (and systems) rather than others.
At the beginning of that write-up you referred to a movie as some inspiration which I had intended to look up. Did that movie include any inference of lycanthropy. Just curious if you had something to work with in your mind before sitting down with the players.In the case of the Cthulhu Dark session that I've spoken about in this thread, there wasn't any prep: the players established their PCs' raisons d'etre, and I used those as a starting point to then frame scenes/situations. And for making moves, I didn't need any prep because I drew on the elements that were in the scenes and situations plus tropes and genre (eg the lycanthrope stuff). In this respect, I think a one-shot is different from a game like AW that is meant to be played, and to unfold, over multiple sessions.
When I have not documented anything for prep, I usually have some ideas running in my head before the game which I intend to inject into the fiction.
Often, as a procrastinator, I have to panic-brainstorm in the shower before my mates arrive for our in person games.

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