It's a mostly observation. It describes the trial, sometimes day by day, and it tries to see it from all sides: judges, prosecution, lawyers, victims, police, perpetrators, bystanders. You get some insight into the mechanism of a trial which cannot be allowed to fail, the evidence, how the trial affects people, and for some of the accused what their motives were, but most of the perpetrators were dead (they blew themselves up), and the important ones that remain keep their mouths sealed for most of the time. It is very well written, so much that it sometimes comes across as fiction.

The book doesn't judge. It tries to bridge, or rather narrow, the gap, a bit. It doesn't succeed, which is practically impossible, certainly within the given setting, but it's a praiseworthy attempt at dealing with a rather traumatic event in clean and compassionate way.