The Night Spider is a pretty good serial-killer thriller. It's well-written, with some casual tag-lines and inside jokes to contrast with the criminal subject matter. Lutz did a clever job coming up with such a ritualistic m.o. for the killer, Mandle. The traumatic childhood stuff worked in convincingly with his spider obsession, as well as his psychosis.
I'd have liked to see more of his youth, more background--what was a messed-up dude like Mandle doing in high school? Well, we get a glimpse of a disastrous teenage date, but that's about it. Nonetheless, the evolution of Mandle's sickness combined with his military training and experience, not only gives a plausible explanation to his nearly superhuman skills, but simultaneously enables his need to kill.
We might say that he got training to go on a private war. Left unsaid, though, is what happened right after he left the military, and before he became the Night Spider. There's all sorts of situations, any social situation, really, where a sociopath would have trouble functioning in (mentally if not overtly). We don't get to know him, except in flashbacks or asides. So we miss a lot of creepy possibilities, not necessarily violent, or even criminal acts, but the trauma such a person might face just dealing with daily life.
I agree with those reviewers who say that there's too many victims. Inevitably, we have to meet a host of new characters, the sudden appearance of which marks them as the next victim. So there's no space to really develop most of the victims as people with this or that personality. I also agree with the comments pointing out how anyone could remain completely asleep while they were being manhandled, not to mention being wrapped up like mummies. I thought this 'process' was going to be explained by Mandle somehow drugging the victims first, but, no.
The main characters are a mixed lot. Mandle himself is only partially filled in, as I've indicated. Among the cops/good guys, Horn is good enough, and Paula, but Bickerstaff was forgettable. Marla is interesting, Nina is ok. Anne should be built up more considering that she's crucial to the plot, but she's in crisis mode the entire time, reacting and dealing with stress. For all the trauma, she never really comes alive.
The questionable types: Kray, and the other Special Forces guys, are done with considerable nuance. Who didn't think that the metal sculptor wasn't involved somehow? Kray's pretty much that guy's opposite--apparently correct and above-board, but completely rotten underneath. The best of the red herrings is Paula's new 'person of interest' (doubly so), Harry. He seemed just a little too eager with Paula to have just a romantic interest in her.
Oh well, he's just that way. On the other hand, I wasn't surprised that Vine was involved. The entire sue-the-hospital subplot, involving Anne as it did, had to be more than a diversion. The other problem with Vine is that he's a non-entity. Aren't serial-killers (even copycats) supposed to be interesting?
In fact, the Special Forces deal (Kray's unit that is), despite its crucial role, wasn't really played out as much as it could've been. I know that would be a different book, still, along with the holes in Mandle's history, we just get a small serving of follow-up. I agree again with those who feel that the book seemingly ended with the discovery of Mandle's corpse.
Lutz threw us into overdrive with the Kray/Vine follow-through, which wasn't at all bad, but I don't think killing off our main character was the best idea. If Mandle is killed at another point, much sooner, or much later, I think The Night Spider might've been more interesting. Maybe if he goes down early on, then there's a string of copy-cat killers (Kray's guys).
That would keep Horn huddled with Marla over those corn muffins.