Crying Bullets: A detective based, school shootings novel

Arnie Penxa, ex war veteran and retired Detroit policeman, now working for a private school security firm, sniffs out a conspiracy for a multiple school shooting. The problem is that nobody wants to believe him except for a few close friends, so he's forced to act mostly alone to bust up the plot. Forget the usual suspects. This is the Mad Motor City where the line between common sense and criminal behavior is never clear.