An intellectually curious girl from a small Montana town in the 1980s, who forms a mentoring relationship with Odile during a turbulent time in her life.

An English woman living in Paris who finds friendship at the American Library and shares a complex relationship with Odile.

A Jewish academic and library subscriber in occupied Paris, whose challenges highlight the historical context surrounding her character.

Odile’s supportive partner at first, whose transformation during the occupation underscores personal changes induced by external pressures.

Odile’s twin brother who joins the French army, influencing Odile’s perspective and relationship decisions.

Rémy's fiancée and Odile’s friend who works at the Library; their friendship experiences trials due to the war.

A traditional police captain in occupied Paris, whose actions and fears illustrate the complex moral landscape of the time.

The director of the American Library during the occupation, based on a real person, who plays a formative role in shaping Odile and embodies courage.

A woman grappling with the loss of a son in wartime, whose rejection of her sister after a divorce leaves a significant impact on Odile.

Lily's best friend, who experiences similar challenges of jealousy and friendship dynamics paralleled in Odile's experiences.

A hardworking man who, while protective, is encouraged by Odile to better understand and support Lily’s aspirations.

Lily’s stepmother, whose relationship with Lily evolves as Lily matures and gains empathy, facilitated by Odile’s influence.