This book was definitely creepy for me. During and after reading In Cold Blood
I was constantly worried someone would break into my house, then kill me. I think the creep-factor has more to do with this being a true story than anything else, and that people these days are capable of doing even more heinous things than Dick and Perry did.
(Just fyi: It's obvious (in the book) that [a:Truman Capote|431149|Truman Capote|http://d202m5krfqbpi5.cloudfront.net/authors/1220960599p2/431149.jpg] favored Perry.)