When last we left the Mystery Teens of Tackleford, at the end of The Case of the Missing Piece , they had mostly stopped solving mysteries, and two of the core girls, Lottie and Shauna, had just fallen out. That’s what the title refers to for this final collection: not the supernatural menace that threatens Tackleford (which is quite real and sinister), but the break between two of the main characters.
This is the tenth and last Bad Machinery collection, The Case of the Severed Alliance . Creator John Allison has a short afterword where he says his original intention was to have one case for each term of the Mystery Tweens/Teens’ seven years at school, which would have been twenty-one books. He gives a few reasons why he only made half that many stories, but I think he quietly missed the most obvious one: time. Allison is a creator whose stories take place in time. He sometimes drops back into the past – the Bobbins flashback series, for example, or, in an odd way, all of Giant Days – but time always passes in his stories, things change, and his characters grow older. The Bad Machinery stories came out about two a year, not three a year, and I think his characters just grew up, in his head, faster than he expected.
The Bad Machinery books are a creative peak for Allison – he’s had several; most people are more familiar with Giant Days – with a big cast well deployed, a complex and quirky world for them to live in and explore, wonderful dialogue on every page, oddball supernatural menaces that lurk deep in the story and only emerge fully near the end, and long rambly plots full of interesting incidents and unexpected moments that all come together for bang-up finishes. These can’t have been easy stories to plot, write and draw; my sense is that Allison is more of a plotter these days than a pantser, but any multiple-times-a-week comic is going to morph and change as the individual installments come out, so I don’t think anything quite ended up exactly the way he expected.
In any case: this is the “teens get jobs” storyline. All six of the main cast are about 15-16 here. Lotty works at the local newspaper, partially to have a work-study arrangement (called “P&Q” here, which is some British term that I don’t think is ever spelled out)  and partially because she is frustrated with her lack of movement in her preferred solving-mysteries-as-a-teenage career. (Yes, that is a thing in the Allisonverse, with glossy magazines and gala awards and all. See Wicked Things .) And Shauna is working for Amy Beckwith-Chilton, one of the old-time Tackleford characters, in her antiques shop, along with a young man named Romesh who Shauna found and who has a mystical ability to detect valuable antiquities among junk.
But the story is mostly about the gentrification of Tackleford: the main street is filling up with posh, expensive shops, rents are skyrocketing, houses prices are ditto, and an “Inland Marina” is being built where the kids used to swim in the local river. We also meet Sewerman General Johnson, the tough man who keeps the drains of Tackleford running, and the massive, possibly sentient, Tackleford Fatberg that he’s been trying to break up. Amy and her competitors in the very Lovejoy-esque antiques trade are chasing after the fabled cursed Pearl of the Quarter, a gem of immense power that disappeared at the death of its previous owner Tommy Binks, the man who made Tackleford the modern success it is.
Oh, and there’s something going on with Tackleford’s sister town, Wendlefield, which is as run-down and hopeless as Tackleford is shiny and expensive.
Shauna and Lottie work opposite ends of this mystery – do they eventually come to find it is the same mystery? Are they forced to work together? Is there a shocking confrontation in a half-constructed industrial scene? Has the mystic Pearl been incorporated into some weapon that threatens the whole town? Is there a fiendish villain who must be stopped? Do all of the Mystery Teens, and their new powers and abilities – I’ve neglected to mention that Mildred has been learning to drive a car! – come into play at the end? Is Tackleford saved?
Reader: yes and yes and yes and yes and yes and yes and sort of.
I would not start here, if you haven’t read Bad Machinery. Severed Alliance is wonderful and funny and exciting and marvelous, but it works much better if you know the characters. So find the first book, The Case of the Team Spirit , and start there. But Bad Machinery is awesome; you should read it if you haven’t already. And if you read it online (it was originally on Allison’s site but now lives on GoComics ), it might be time to get the books and read it again.
 Utterly nonamusing anecdote: on a call with some Brits this past week, I realized that what Americans call an “intern” (college-age person working in a business for a limited period of time, usually tied to and providing credit for their school) is called an “apprentice” in the UK. This, I think, is a similar issue.