I don't own this, but have been working on a mix of games without manuals, and came across a screenshot at http://www.wadjeteyegames.com/forum/index.php?topic=1302.0 that shows a .txt file called "Gemini Rue Manual." The thread is about a collector's edition of the game, but would someone who owns the GOG version please check and see it such a file is there? Many, many thanks!

The mix: http://www.gog.com/mix/gog_games_without_manuals_where_to_find_them

Thanks; I appreciate you looking.
EDIT: I've fired off an email to them asking about the file, and (if it exists) if it would be possible to get here.

Thanks for the kind words! I started it because I kept forgetting which GOG games I owned that didn't have manuals...every time I reinstalled, I'd have to go on a hunt. Hopefully, others will find it useful as well.

I have an official reply:
"Hi John. We never wrote a manual ourselves. I can only assume that yes, it was probably written by the people who made the collector's edition (which was sold in a physical box in the UK). We didn't have anything to do with the making of it.

But we designed the game to be played without a manual. The in-game tutorials pretty much cover everything. Nobody has ever been confused about the mechanics yet!

-Dave"

Thanks again for the help!