How forgotten is this book? Well, it was nominated for an Edgar® in 1976, and the last time I looked at the Edgar® database, the title was listed incorrectly (as The Assassination). It's a first-person police procedural in the Dragnet vein, about a serial killer. And it's 138 pages long. Now that's my kind of book.
When I read this book back in the middle '70s, I was taken by the narrative voice, which reminded me a bit of Joe Friday, but not quite. Maybe it's time to mention that the only other book I have by David Vowell is Dragnet: 1968. I haven't read that one, but Vowell was also the writer on a number of the much-maligned '60s revival of Dragnet on TV.
Reading The Assassinator now, I find it disturbingly homophobic, something I didn't notice thirty-odd years ago, to my shame, I guess. I was still taken in by the voice, though. Imagine a book, even one as short as this, with almost no dialog. That's what you have here. It's a tough trick to pull of, but Vowell does it, and you almost don't even notice it. The procedural part's good, too, very Dragnet, as I said. Good book if you can get past the gay-bashing, and worth a read. It sure won't take you long.