A Book of Loose Ends
A directory of real life mysteries and unresolved situations from ancient times through to the present day, with absolutely no UFOs, ghosts, conspiracy theories, AI, creepypastas, fakery, supernatural stuff or any other junk. This book also avoids mentioning murders as far as possible (though a handful with particularly odd circumstances are included).
It contains concise overviews of 108 loose ends in categories including history, missing treasure, uncracked codes and mysterious writing, strange broadcasts, art, music, literature, films, games, aviation, seas, space, the Cold War, missing nuclear weapons, submarine sinkings and various other stuff. There is also a section at the back for recently resolved loose ends.
This book is DRM-free and is 100% made by humans. No AI of any kind has been used at any stage for any purpose.