I am Not a Serial Killer by Dan Wells... first of the John Cleaver series, the second book Mr. Monster is already available in the UK, out in the US in September.
Seriously, you guys need to give this book a look, it's excellent in my opinion. Fans of the TV show Dexter should certainly give it a go. It's a first person narrative from a 15 year-old sociopath who is obsessed with serial killers as he struggles to control himself to not become one. Through all this a real serial killer visits his small town, which to him is like your favorite rock band having a concert in town. So, he goes out find out more about what is going on, and since his family are morticians, he has access to the dead bodies when they're released to them. Well through all this his "monster" gets harder to control, etc. etc.
Anyways, a very good read about a very creepy kid. The main character is great, and he does a good job making you sympathize with him even with all that he does and thinks about doing. The novel has a bit of the supernatural though, so fair warning there.