much better when you're writing about people misbehaving. The initial part of the story read like your usual engaging story, with characters who are unrepentant shit-disturbers but nevertheless real.

Once the "people doing wrong" started getting their "punishment", things went downhill. The story became more of a summary and less of a story, as if you lost interest in the details and just felt the need to finish off the plot. From the introduction ("a completely conventional story"), it seems to me as if you aren't really interested in this kind of thing anyway.

The interconnections started getting really strained right about the time you introduced the legless lady in the car. Not everything has to have a meaningful connection. Hell, most of it could have been left out without damaging the story, IMO. I could buy the heart attack due to the girl stealing her boss' pills, although that should have been introduced earlier so it didn't come out of nowhere, but most of the rest... not so much.

As much as I'm not a fan of bad behaviour, your stories usually keep me interested all the way through.
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Who needs to be big and burly when you can just apply physics?