This was great! I actually thought the cliffhanger would happen after the point when Clash said his theory, so I was pleasantly surprised that it wasn't over.
I like the use of the unreliable narrator, but I didn't like how the MC always comes across as accusatory even if you try to be friendly. I think it might be better if friendly MC brings it up with Clash after talking with the suspect instead.
Also not sure if this is a plot hole, but wouldn't the manager have recognized the MC?
Anyway, I'll also echo that I love Clash as a character. I enjoyed it overall, just needs a bit of polishing. Great job!