When hooded stagecoach robbers accidentally steal a strongbox containing U.S. mail along with their loot, they make the mistake of committing a federal crime--and tangling with U.S. Deputy Marshal Custis Long.

The robbers have a clear M.O.--always working as a pair, they hide their faces and do their talking only with their shotguns. With little to go on in terms of the thieves' identity, Longarm follows a trail of clues to a Deadwood bordello, where he learns that a little pillow talk might just get a man killed...