Miss Bianca is a white mouse of great beauty and supreme self-confidence, who, courtesy of her excellent young friend, the ambassador's son, resides luxuriously in a porcelain pagoda painted with violets, primroses, and lilies of the valley. Miss Bianca would seem to be a pampered creature, and not, you would suppose, the mouse to dispatch on an especially challenging and extraordinarily perilous mission. However, it is precisely Miss Bianca that the Prisoners' Aid Society picks for the job of rescuing a Norwegian poet imprisoned in the legendarily dreadful Black Castle. Miss Bianca, after...