Read the book??

I remember doing a book report on this book is like the seventh grade or something.. and we had to make our own little picture book of it. I liked the story back then. I think it was like.. elementary school level mystery or something. But I got sucked in. And occassionally when I heard something like "Someone was watching" or hear something similar to the story line I think of the book. That was the case today.
I think I'm going to go find the book somewhere and read it, then check out the film version!!