OK, it is driving me crazy, I have been trying to remember this show from when I was a kid. There was a typewriter that typed on itself (sort of sounded like it was talking), kids solving a mysteries, and I believe it was in an antique store. The only thing I have been able to find out was that it is not ghostwriter.

I think you're remembering "Read All About It."

If that's it, please rate my answer.