The mystery that was referred to by Larry Howe is by Julie Smith and is called, "Huckleberry Fiend". It is an enjoyable book and gets most of the Twain stuff right as the plot romps around the SF Bay Area and Virginia City. Of course, the finding of the first half of the manuscript seriously dates it now. Another less enjoyable mystery (pre-dating the Peter Heck series currently underway) was "The Mark Twain Murders" by Edith Skom. It had little about Twain and even less to recommend it. Dennis Kelly