The older, cantankerous owner of Primrose Hill Books, who initially clashes with Grace but eventually forms a deep friendship with her as they bond over their shared love of books.

A supportive friend of Grace's late mother who provides Grace with a home in London. She offers Grace maternal guidance and influences her development during wartime.

A charming young engineer who introduces Grace to the world of literature. His role highlights the potential for romance despite being mostly absent due to the war.

An initially strict ARP warden who works alongside Grace during air raids. Over time, he develops respect for her as they face the challenges of wartime together.

Grace's outgoing childhood best friend who moves to London alongside her. She embodies the adventurous spirit of women who sought new roles during the war.