This was an excellent book. It definitely straddles that sometimes fuzzy boundary between young adult and adult fiction. The plot was complicated to follow at times, due to much of it being based upon the fevered memories of the dying protagonist Gabriel. However, Hartnett's prose is beautiful and suffused with dread and this was what really pulled me along as I read.
Below is one of my favorite passages.
"In my mind I've largely accepted death- it's only my body that hasn't. It has a right to protest, I suppose: in the remote likelihood of an afterlife, it knows it isn't invited."