I read
THE BUNKER DIARY by Kevin Brooks, billed as SAW without the gory bits or like LORD OF THE FLIES, about a boy who is abducted and shut in a bunker with 5 other people, and the man who did it plays sick psychological games with them.
It was very well written, because I can't stop thinking about it, but, well...before I read it, I'd never found a YA that was too dark for me - and now I have. The bleak ending stayed with me, and I almost wish I hadn't read it because it's all I can think about. Apparently he wrote it a few years ago but it was turned down because it was too dark for YA, publishers thought it was just too hopeless. It's only now been allowed.
But if you like that sort of stuff, it's a brilliantly-written book. Kevin Brooks is a genius (and also from Devon, gooooo Devonshire!
)