After I saw a post on Metafilter about Adam Cadre's writing, I read one of his stories online (see here) and I requested Ready, Okay! from my local library. I finished it today.
I think I'm going to put this one on my short list of books to get as gifts. It ought to appeal to anyone. I wouldn't have said the high school setting would have caught me, but the characters and the looming doom did.
There are many surprises along the way. Vonnegut said throw suspense out the window and tell your readers everything; this fellow has done something similar, but he does keep some secrets right up to the end.
A lot of books about youngsters seem to use the idea of a precocious narrator, but I like it here better than most. The main character develops some great insights along the way; most importantly, he learns that people aren't usually who they seem to be on the surface.