There's a Dead Person Following My Sister Around by Vivian Vande Velde

What do you do when your annoying little sister has imaginary friends? You ignore her, of course. But Ted becomes less annoyed and more intrigued when his sister Vicki’s imaginary friends take a very scary turn. When the two ghostly visitors gets into Ted’s dreams and start to do some real haunting, Ted needs to dig into the history of his house to find out what they want, and how to stop them from hurting anyone in order to get it. When Ted finds a journal belonging to an ancestor, he begins to untangle the mystery and works toward helping these ghosts find their rest after so many years. A spooky ghost story, and extremely satisfying as a problem-solving mystery.

Cool web site:

http://www.vivianvandevelde.com/books.cfm

Go to Vivian Van Velde’s web site. Click on the Books for Teens, or the Books for 8 to 14 year olds. There are so many great titles! She does fantasy, fairy tales turned on their ears, and cyber fiction. Check it out!