Thanks, I've seen beedle around here.
I did some more searching and might as well post what I found. I didn't know how bad you wanted the answer to the question, not that I mind searching, I enjoy it - and I found some great sites - what an interesting character he was.
Bierce himself ironically wrote at least two stories about people disappearing:
"The Difficulty of Crossing a Field" and "Charles Ashmore's Trail."
Robert Heinlein wrote a short story with Bierce as a character, this might be a good candidate.
Heinlein page
near bottom of page
". . .The title "Lost Legion" (Super Science, November) has nothing obvious to do with the story to which it is attached, which has some nice young people developing super powers under the tutelage of Ambrose Bierce. Heinlein later included it in one of his collections under the title 'Lost Legacy' . . ."
These are mysteries, probably not helpful:
http://www.greenmanreview.com/ambrose.htm
"Oakley Hall uses San Francisco of the 1880s and 1890s as the setting for
Ambrose Bierce and the Queen of Swords and
Ambrose Bierce and the Death of Kings, two mysteries featuring the journalist, satirist, and short story writer Ambrose Bierce as an amateur detective. Tom Redmond, a journalist mentored by Bierce, narrates the books. Bierce and Redmond act as a team, with Redmond doing most of the legwork and Bierce doing most of the deductive work. Bierce drives the plot forward -- he steps into both stories at crucial times to give Redmond direction and ultimately drives each mystery to its solution. Since the mysteries involve high profile victims (Hawaiian nobility in
Ambrose Bierce and the Death of Kings) or high profile suspects (railroad and mining magnates' families in
Ambrose Bierce and the Queen of Spades), Bierce's fame allows him to move in society circles that Redmond cannnot reach on his own and gives access to information crucial to the solution of both cases."
Adam Niswander, author, sci-fi
http://www.ioba.org/newsletter/V8/niswander.html
"
The Repository features Ambrose Bierce, the famous writer, who now is an investigator for Satan's Legions making a report to his boss about their failed battle with a fellowship of magicians."