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Finished The Shadow Club by Neal Shusterman.
I ordered this (and its sequel) because I really loved his book Unwind.
The Shadow Club was interesting (and very short) but not as compelling as Unwind. (Of course, this one was written in 1988, so clearly he's been writing for a while.)
The Shadow Club is seven kids (in middle school) who are all second best at something. The people who are the best are also the people who make their lives miserable. So the second bests band together and decide to start pulling harmless pranks on them. It's dumb stuff, really--spiders and snakes put in various places to scare people, posting a page from someone's diary so everyone can see it (okay, so yeah, not nice things to do, certainly, but nothing that will cause irreparable harm).
Except soon it spirals out of control.
If you have, say, two hours of reading time, you could definitely do worse. :) (But read Unwind instead, if you haven't already.)