The Curious Incident ..
I bought this while I was out in SF to have something to read on the coach trip to Yosemite. It's not a long book (appx 220 pages) and I finished it in a couple of hours.
The premise is fairly straightforward – teenage boy finds neighbours dog killed in their garden and sets out to find out what happened, along the way stumbling into a revelation that even the most emotionally well adjusted teenager would struggle to cope with. This, in turn, leads to an adventure made all the more remarkable by the fact that he suffers from a condition (never stated, but I guess it's a form of autism) which leaves him unable to interact emotionally with other people.