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You're running at an RPG convention. You've pitched, in a moment of madness, a 3-hour session based on the novel. What system do you use? What's your plot structure or notes? Who are your pregens?
This is a great question. I need to think about it a bit.
The system would certainly be something like what I described in another answer, where people could quote lines of notable text. For plot structure, I can't see myself repeating the plot of Mort - I'd go Mort-adjacent. Maybe a sequel, or perhaps a 'previously undiscovered' chapter of the book between other events.
I'd probably make the characters first, as that would help jumpstart the plot.
So, Pregens? Mort is a possibility, though by no means a guarantee. Let's keep him in the back pocket. Other characters might be:
And maybe the scenario begins or ends with a quiz night... a quiz night that Death happens to be attending in an effort to have 'fun'....