The murder victim with a hidden past, starting a new life under an assumed identity. His actions are driven by a desire to escape his previous misdeeds.

The devoted wife of the murder victim, known for her unwavering support and involvement in the creation of a false narrative to protect her family.

Portrayed as a charming young woman who conceals her darker, calculating nature, with intentions linked to her advantageous marriage plans.

The narrator and loyal companion to Poirot, who is drawn into the investigation and has a personal romantic subplot.

The passionate son of the victim, whose impulsiveness and complex relationships make him a central suspect in the case.

A passionate former lover entangled in the investigation due to a mistaken letter, who evolves to protect someone she cares about.

A resourceful young woman and Hastings's romantic interest, whose actions are motivated by loyalty to her twin sister.

A detective from the Paris Sûreté, representing the modern, evidence-focused approach to investigation, contrasted with Poirot’s methods.

A mysterious figure from the victim’s past, linked to prior deceptions and central to the unfolding plot.

The reliable secretary to the murder victim, providing insights into the victim’s relationships and situation.