I'm a pretty big fan of this trailer, I have to say.   The production quality is really high.  When I watch movies, I often complain that the music or sound effects are so loud that I can't hear dialogue.  The sounds here are creepy without overpowering the boy's actions.  In terms of camera work, the close-ups and farther away shots are all perfectly timed.  I also like the bit at the very end.

What do you think of the trailer?  Do you plan to read Hollow City once it releases?