Annie's deceased great-aunt, whose diaries and archive of secrets influence the narrative. She is a mentor figure known for her meticulous secret-collecting, while her personal history adds complexity to Annie's investigation.

A supportive mentor to Annie and a historical figure connected to Frances. His humor and loyalty hide deeper family resentments, playing a crucial role in solving the mysteries.

The antagonist driven by a sense of justice turned into a violent obsession. His actions impact multiple timelines, intertwining with the central mysteries of the story.

A fortune-teller connected to the novel’s mysteries, whose past actions reveal a strong moral code and courage. Her cryptic guidance helps Annie piece together unresolved events.

An enigmatic figure involved in the concealment of family secrets. His ambiguous actions and relationship with Frances highlight the novel's themes of wealth and influence.

A character marked by trauma and loyalty, involved in past events that shape the current mystery. Her decisions reflect her complex ties to the Foyle brothers and the secrets they share.

A reliable detective who assists Annie, balancing official protocols with her unconventional methods. His partnership with Annie grows from professional tension to mutual respect.

A police station receptionist linked to past events, whose actions connect her with key mysteries. Her strong sense of justice evolves, affecting her choices in the present timeline.

Posthumous figures whose past crimes set the stage for the story's mysteries. Their actions critique the aristocracy's ability to mask wrongdoing with privilege.

A character burdened by his family's legacy, conducting his own investigation into his past. His findings provide crucial insights without losing his personal perspective on inherited secrets.