Yep, that's what happened. The link has been corrected in the file on my hard disk, and I'll upload it when/if I ever get my FTP back.
As to the music at the head of the chapters in A Chorus of Detectives -- I have no idea what that is. I doubt that anyone at the publisher or the printer knows either; it's just an ornamental slug that the book's designer thought would look nice there. It doesn't even have a clef sign, but it must be treble clef.
You know, seacliff, I never even wondered about it until you asked the question. Ha.