Ginger is a headstrong and clever woman who joins Mark in the investigation and proves to be a key partner in unraveling the mystery of the Pale Horse. Her character is marked by street smarts and a determined pursuit of the truth.

Detective-Inspector Lejeune leads the official investigation into the suspicious activities surrounding the Pale Horse. He is a competent and perceptive detective who remains suspicious of key suspects throughout the case.

Ariadne Oliver is a well-known mystery novelist who offers guidance and advice to Mark during his investigation. She serves as a sounding board for his theories and contributes valuable insights at crucial moments.

Father Gorman is a kind and respected Catholic priest in the rural village who becomes involved in the mystery after a significant confession. His actions and foresight provide crucial evidence that helps to solve the case.

Thyrza Grey is a spiritualist at the Pale Horse and plays a central role in the events surrounding the inn. Initially appearing as a gentle countrywoman, she is involved with other women in conducting mysterious rituals.