A mouse named Hermelin can read and write. He uses these special powers to solve mysteries such as missing fish, glasses, and pearls on his dense city street. He even saves a baby! But when the people throw a party at the corner sausage shop to thank him, they are shocked that a vermin mouse shows up. This causes Hermelin to realize that he is a pest, which hurts his feelings. Fortunately, a little girl who lives on the block, a bit of a detective herself, figure out that Hermelin has been solving the neighhorhood crimes and invites him to be her friend and partner detective.
I love this book's depiction of city living and close neighborhoods. The illustrations are also fantastic, and the narrative fun.