Strategies of Prose PackagingnR.H.W. Dillard: The First Mannon the Sun; Louisiana State UniversitynPress; Baton Rouge.nPopular books---science fictionnand mysteries, in particular---nare often available as doubledeckers:ntwo plots in one package,ntwo novellas for the price ofnone, as distinct from the tfpes innthe 19th century, when one . . .