Well, darn it. I snagged this off the library shelf because it was a slim volume and I was waiting for my "books on hold" series (three currently in progress) to come in. BUT this is book 19 of the series! NOW I have to go back and read the first 18 installments to get all the back story. I was trying to avoid new series until after the new year!
Set in the late 1950s or very early 1960s, Spencer (writing in 2008) has produced a book that is not only entertaining, it is an almost "must read" in the post-2016 era. Although she calls the young men in the story "hard mods" they were usually referred to as "street mods" (vs. posh mods like Elton John and John Lennon) and are the original (or are one of the original) groups from which today's skinheads and alt-right and white nationalists developed.
The Prologue reports the death of a tramp, and Chief Inspector Woodend and his team are sent to investigate. But the investigation is hindered by the town council, Woodend's superior officer (superior in rank but a foul human being) and the complete incoherence of the tramp community whose members are working hard to be invisible from town folk and each other. It's also hindered by one detective's love life which is of far more interest to him than the case.
If you are looking for a historical police procedural series to start, I'd say give this a try. If you just want to read a book about how the Neo-Nazi party got started in the 1950's read this.