Someone that Vincent Plum Bail Bonds had put up the bail for skipped town, and he'd put up his deli as collateral. Vincent's father-in-law (the owner of the Bail Bonds) has decided he wants to diversify, so he's hanging onto it. The catch is, the last several managers have disappeared while working. So Vinnie's decided that 1. Stephanie is the new manager; 2. She needs to find out what's going on to get the other manager's kidnapped/killed/whatever; 3. She can take care of her bond enforcement job during the off hours.
That's pretty much all you need to know. Stephanie's running a strange little deli with Lulu as the assistant manager/sandwich guru. There are three other employees there who really know what they're doing (mostly doing drugs while toiling away at a minimum wage job). Hijinks ensue—her car is stolen, she tracks down a couple of skips, she looks into the disappearances (with help from Joe Morelli and Ranger), and things get weird at the deli (particularly due to Lulu, who becomes a social media sensation of the moment).
I must say that Stephanie seems more competent at this gig than a lot of the other jobs she's held over the course of this series—either in an undercover assignment or because she was trying to do something other than bond enforcement. If it wasn't for the distraction of the investigation (and Lulu), she probably could've made a decent go of it and changed the series for good. It was pleasant to see her not horrible at something.
We get a little bit of another of Stephanie's supernatural acquaintances, Gerwulf Grimoire (Wulf), here, but in such a small amount that I'm really not sure why Evanovich bothered. That said, if she was determined to use Wulf, this is precisely as much as she should.
I still don't get what Stephanie sees in Joe, or what Ranger sees in Stephanie, or why Joe or Ranger let this stupid triangle continue. But I'm at peace with that—I'll never get it, and Evanovich will never change it, why fight it?
If this had been part of any other story, I'd say the solution stretches credulity too far. But as it's a Plum novel, I really don't think I can. Honestly, it was only as I was gathering wool a couple of days later that I gave it any thought.
One last thing: I'd read the blurb for Twisted Twenty-Six a few weeks earlier, and was looking forward to reading it more than I have since the mid-teens (I'm guessing). So, it turns out that I was already primed for the near cliff-hanger last couple of pages. I don't feel too bad saying that because it really doesn't have much to do with this novel (although events in it do tie-in), but it's something I have to talk about because I don't remember Evanovich doing this in the previous twenty-four novels.* Evanovich doing anything new at this point is something to note and celebrate.
* Feel free to correct me in the comments.
This wasn't anything special, but there wasn't anything annoying about it, either. Which sets it apart from the last handful. Evanovich ticked all the boxes she needed to; got Stephanie into a new situation and had her handle it in a non-disastrous way; and capped the book off with something new. I can't imagine Evanovich will return to the comedic heights of the early series—and I imagine even less that she feels any compulsion to do so. I just hope for a reliable level of moderate entertainment, and that's what she delivered. It's a decent time, but if you're new to Plum—go back to One for the Money and immerse yourself in the first dozen or so of these before taking the plunge into the higher numbers.