It looks like a promising text to me.
I'd say there are two distinct parts: one before, the other one after the moment
Can I have your autograph?
The first part runs quite nicely and tension rises gradually (who's in the Mercedes? what do they want? are they going to get violent?). The woman is both vulnerable and incapable of realizing the danger -- I think the effect was great.
In the second part, the intensity of the conflict drops (aw, so he just wanted an autograph). Of course, there's a new conflict now (what fame is this guy talking about? what world is he coming from?). But readers expect this conflict to be solved, or they feel cheated. And what you solve is only the first part's conflict (so James' fear was legitimate)!
I think the information you provided is a puzzle with more than half of the pieces missing. The story can be interpreted in many ways. Maybe the driver is James' son (as Muffin Man says). But why didn't he just ask for an autograph in the first place? Was all that fuss needed? Or: maybe James
is supposed to become famous one day, and now he's being chased by his fans landed from the future. Or maybe his son is supposed to. There is a hint in that direction:
Quote:
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He’s gonna be a stand-out, that one. Just look at them eyes.
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Anyway, it's obvious you know "the right answer," and perhaps you should bring more pieces of this puzzle into light.
And a last comment. At times, the plot advances a bit slow. James seems overly concerned, his wife goes on with her placid attitude, and nothing happens. I feel that many passages and scenes could be simply cut off.
All in all, I enjoyed it.