This one volume has the first three books in Margery Sharp's out of print "Miss Bianca" series. This volume contains The Rescuers, Miss Bianca and The Turret. These are the adventures of the Mouse Prisoners' Aid Society in their quest to free humans in distress.
Margery Sharp was born Clara Margery Melita Sharp in Salisbury. She spent part of her childhood in Malta.
Sharp wrote 26 novels, 14 children's stories, 4 plays, 2 mysteries and many short stories. She is best known for her series of children's books about a little white mouse named Miss Bianca and her companion, Bernard. Two Disney films have been made based on them, called The Rescuers and The Rescuers Down Under.
In 1938, she married Major Geoffrey Castle, an aeronautical engineer.
What a delightful trilogy - I'm not sure why the Miss Bianca books appear to be out-of-print, but I do hope someone corrects this soon! This series is very British, with talking, heroic mice rescuing prisoners of all stripes. The Prisoner's Aid Society will be familiar to anyone reading "those sorts" of British books, as will the characters (I loved Miss Bianca's attitude of noblesse oblige at all times).