I wonder if I've done something wrong during the sign up, or if the story is getting lost in amongst all of the other free stuff. A quick look on the Amazon store seems to confirm that the story is free to borrow. Strange happenings indeed!
My other good news is the "Cthulhu and How I found Livingstone" book, which has sold 9 copies at DriveThruRPG. This is because the book is currently on the "new in the store" page. Within a week or so, it will slip off that page into obscurity and the realm of zero sales (well, maybe one sale every few months).
All in all a good weekend.