Victor encounters whom while hi waits to ever Geneva? Upon this sighting, who does he believe is guilty of William's death?

Despite his joy at being reunited with Geneva, his fear returns. He arrives at night, in the midst of a severe thunderstorm. Suddenly, a flash of lightning illuminates a figure lurking among the skeletal trees; its gigantic stature betrays it as Frankenstein's prodigal creature. At the sight of the "demon," Victor becomes absolutely certain that he is William's murder ­ only a monster could take the life of so angelic a boy.