I picked up the book and couldn't put it down until 2 days later when I finished it. I was stoked when I found out there was a movie that's (loosely) based off the book. If you're a reader at all, get the book. The intensity of it is unbelievable. The movie was....eh. They just didn't capture the insanity in Gacy and how badly he got into this kids head. If you're not into books, it's a decent movie I guess. But do yourself a favor and get the book.
Review of Dear Mr. Gacy
