The Guilty Abroad — Peter J. Heck

Mark Twain is in merry old England to see his family. Wentworth Cabot, Twain's assistant, is looking forward to seeing the sights, and hopefully finding some peace and quiet--when not helping his boss with a new lecture series.

But peace is the last thing they find when they bump into Slippery Ed, a con man from New Orleans and an acquaintance of Twain's. Ed convinces Twain and his family to attend a seance. The famed author is skeptical of "spooks." But when another attendee is murdered, Twain must discover whether the killer is one of the flesh-and-blood members of the audience--or a specter from the beyond...