Here Comes Thursday by Michael Bond
There can't be many people who haven't heard of Paddington Bear, created byMichael Bond. But I wonder how many of the other characters created by Michael Bond you know of. Amongst them are Parsley the lion & Dill the dog from The Herbs, Olga da Polga - a guinea pig, a dog called Pomme Frites who accompanies his master in the Monsieur Pampelmousse series, even an armadillo called J.D. Polsen. And then there is a mouse called Thursday.
Thursday made his first appearance in Here Comes Thursday in 1966. The book is delightfully illustrated by Daphne Rowles with some very detailed black and white drawings. When we first meet Thursday he is causing a stir by floating in a strange object towards the organ loft cupboard of St. Mary's in the Valley. The resident family of mice can't identify this mystery object in the sky and are very concerned that it may be something sinister, until Grandpa Aristide points out that it is a balloon - with a label and a bag tied to its side. They manage to guide the balloon into their cupboard where the inhabitant of the bag wakes up to find himself surrounded by the Peck family.