Hermelin the detective mouse

A special little mouse who lives in the attic at 33 Offley Street uses his investigative talents anonymously to help solve mysteries on the street, but when his neighbors invite him to a thank-you party in his honor and discover that Hermelin is a mouse, he's unsure whether he will be welcome. Hermelin, a mouse with typewriting skills, secretly helps the people of Offley Street find lost items.