Chapters 22-23 of News from Dead Mule Swamp

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I am closing in on the final chapters of News from Dead Mule Swamp. The really sad part is that I have to work today, and the two other assignments I have pending must be completed this weekend.

These final chapters have to be done well or the mystery won't be suspenseful enough, or have enough action. I might get you to buy this first book, but you wouldn't want any others from me, right? So I want to pay really close attention to detail and timing and tone.

Here's an excerpt from Chapter 23:

    I was brushing my fingers over it to remove any superficial dirt when a hand was placed on my back. I nearly jumped a foot, and indeed, I barked a shin on one of the metal bars.
    “Good Morning, Ana. Are you fascinated by our historic machine?” The voice was Kevin Teeter’s; the tone was edgy.
    Rubbing my shin, I contemplated that tone. I turned, stood up and forced myself to be cheerful. “Mr. Teeter, Kevin, how are you?”
    “Fine, just fine.” he said. The sharpness was gone, and the salesman was back.

At this point there are still several people that Ana is suspicious of... which one is the key to her puzzle?