The main antagonist whose polite demeanor masks underlying threats. Driven by personal gain, he manipulates others in his scheme involving Twin Elms and Riverview Manor.

Nancy’s close friend who contrasts Nancy's calm with initial fear but supports the investigation through courage and practical solutions.

Nancy’s father and a prominent lawyer whose legal battle connects to the mystery. He raises Nancy in an environment that encourages her independence.

An antagonist coerced into staging a haunting at Twin Elms. His involvement with the mystery evolves as he becomes more cooperative.

The elderly owner of Twin Elms who is deeply attached to her home. Her vulnerability makes her a target of Gomber's schemes.

Miss Flora’s pragmatic daughter who seeks Nancy’s help. She’s supportive and provides valuable information about Twin Elms.

The Drew household’s housekeeper and maternal figure to Nancy, offering emotional stability and support throughout the investigation.