I remember really enjoying this book, but my recollection of it is woeful.
The main protagonist is a teenage boy, I think he's hired to do some odd jobs around a large house, or maybe the house belongs to a family member. There is a small shack / shed near the house and inside the shed are a bunch of random items. A book, a lamp, an old table and some other things.
The question has been answered below so I'm going to wrap this part in a spoiler tag:
I think as the story progresses the boy starts having dreams and nightmares about killing people and it turns out all of the different items in the shed belonged to notorious serial killers and they are somehow controlling or influencing him.
I can't remember how it ends.
Set in America, maybe the south, probably 10 - 15 years old.
Any suggestions would be appreciated!