More significantly, the novel functions, in typical Asimovian fashion, as a mystery that begins with the apparent goal of locating the Second Foundation (the mystery that sustained the last half of the
Trilogy
) and then is diverted to locating the power that has kept galactic events impossibly close to Seldon's Plan, with subsidiary mysteries along the way, such as why information about Earth has disappeared from the Second Foundation's (computer) library, why Gaia is feared on Sayshell and why it is not recorded in Foundation files, etc. As a mystery the major question of the novel is who (or what) done it? Various characters are presented as suspects: Pelorat, Compor, Kodell, Branno, and Sura Novi, the peasant woman from Trantor who aspires to be a Scowler (scholar) and, having attached herself to Gendibal, is taken along to the confrontation with Trevise, near Gaia. And, indeed, more than one turns out to be something other than what he or she seems.