Stephen Stewart did attempt to write a conclusion to _Huck Finn
and Tom Sawyer Among the Indians_.  The review is online at:

http://www.yorku.ca/twainweb/reviews/StephenStewart.html

Is there yet another attempted sequel in the works?
Is the availability -- for scholarly research purposes -- of Twain's
marginalia in Richard I. Dodge's _Thirty Three Years Among Our
Wild Indians_ tied to another fictional attempt?  Are not copies
of the marginalia available in the Mark Twain Papers?

Barb