The Prisoners Aid Society of Mice discusses the proposed rescue of a Norwegian poet from the terrible Black Castle.Miss Bianca the pet white mouse belonging to the Ambassadors son is sent to Norway on a mission to recruit the bravest Norwegian mouse she can find. She finds Nils and brings him back triumphantly. Then she Nils and Bernard a pantry mouse who falls in love with her set off for the Black Castle.They set up home in a mousehole in the Chief Jailers room and narrowly avoid the jaws of Mamelouk the cruel Persian cat. Eventually they trick the cat and the jailer and get into the prisoners cell. A dramatic rescue via an underground river and they are all free - and the Nils and Miss Bianca medal for bravery is struck in the mices honour!Ages 8-10.