I can't seem to download samples at the moment.
The iBooks Store may be having problems. If the book never shows up with the SAMPLE ribbon on the corner then it never finished downloading, which would probably be why it disappears after a while. When iBooks gives up trying, it probably deletes the attempt instead of leaving a cover with no content on the shelf.
I may have removed it by mistake.
Just wondering what a sample really gives you.
Thanks for your help.
ibooks are wonderfull!