In the near-future a young man with the very latest hi-tech corneal implants (Google Glasses being so old-fashioned), finds himself unwittingly getting in way above his head when a walk home finds himself in a protest march.
With a political regime that frowns (hard) on protest, he finds his hi-tech enhancement, and the capacity to record what it happening, give him the opportunity to make a testament against what is happening. And it boils down to a choice he has to make.
The POV is expertly handled by Nagata, making for an exciting, readable, believable story.