I read this book in 2009 or 2010. I believe it was considered a young adult book but it was a good reading level for me in 6th grade. The book seems so scattered and has gotten worse in my memory over the years so excuse me if I seem to jump around in the story.
The cover I believe had a sort of symbol that is important in the book. I remember the cover being mostly red and black but couldn’t say for sure.
The main character is a boy around 12 who is in the foster system (?) and comes to live with this old woman who is introduced as talking to the TV (I believe Jeopardy) and talks to the TV as if the person on the show Is talking directly to her (indicating schizophrenia), but the TV actually changes from the show to sending her secret code within the show (?).
Somehow they end up in her house deep in the woods, the child service worker leaves and the boys weird gets weird (in like a magical seance) and he likes to walk around the woods surrounding the property and find a magical wall of some kind that the symbol then becomes important in. The story gets so back and forth from there it would be impossible to explain. This book somehow helped me a lot in the part of life I was in and I really just need to read the series again.