Not every murder. Those who know something do not know enough to guess how many or what they have in common. It doesn't seem to be victim, perpetrator, means, motive, or opportunity. It's just that sometimes a detective appears and for hours or days nobody thinks of questioning their name or authority and afterwards, after the investigation, the summation, and the arrest, the detective is gone and the only remaining facts are that they were there, whoever they were, however they looked like.
Brilliant.
Righteous.
Hating and loving every second of it.
Unable to stop and half-unwilling to.
Only a handful of things everybody agrees on. Not much to begin a case. Across generations of cops only a few did and nobody remembers what happened to them.
(Originally posted on my blog.)