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I want an epistolary murder mystery that takes the form of a thread on a popular website that includes the killer dropping hints and evidence of his crime. When it comes out half the fun will be figuring out which anonymous posts belong to the same person and letting the readers solve the mystery of figuring out which one of the trolls was also the killer.

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If you're into anime, Psycho Pass had a few episode subplot that pretty much was that, minus the in letter format.

And didn't Ghost in the Shell show have plot lines like that, such as the Laughing Man?

Kind of but without spoiling anything that was mostly conjecture by the general populace. A lot of the scenes where Motoko is on the VR-esque message boards are other people speculating on the Laughing Man's motives.

Edit: Though on quick second thought I think there is at least one instance where he does contact her in that space.

Found the killer.

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