My sister is weird...

So I'm staying at my sisters house, and have nothing to do all day, other than play with the dog and watch TV. So I was looking around her house for a book, and I was a little disturbed, here are some of the books she has in her house, see if you can spot the pattern.

• The Mammoth Book of Unsolved Crime
• Women who kill
• The worlds worst Murders
• An Almanac of Murder
• The bone woman
• Agents of Mayhem
• The Coroner
• Sole Survivor
• Hannibal (2 copies!)
• Diagnosis Dead
• Deja Dead
• Suddenly Gone

Normally I like to read before going to bed, ideally something with elves (like legolas) or magic, so that I can have nice dreams. But when I stay at Sandi's house and read books I end up having dreams about slaughter houses and maniac clowns.