Can Hans Heinrich join, too? He has the impeccable loyal subject reputation and all those Prussian historians claiming he was okay with FW killing his son because law, but in the AU, that's just the cover while inwardly, he's lost his struggle to forgive.

And yes, I know which Christie book you mean. Everyone who doesn't, look away for my title suggestion for the AU is a spoiler:

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Murder in the East Prussia Express Carriage?