However, some characters are arguably more developed than others, showing a bit more complexity and internal conflict. These characters might be considered more rounded than the rest:
* Vera Claythorne: She exhibits a range of emotions – guilt, fear, anxiety, and even moments of courage. Her past is revealed, giving her a tragic backstory that motivates some of her actions.
* Philip Lombard: He's presented as a charming but ruthless individual. His past crimes are detailed, hinting at a complex moral compass.
* Emily Brent: She is a rigid, judgmental woman, but her past actions and the guilt she feels for them add depth to her personality.
* Anthony Marston: Although he dies early, his past as a reckless driver and his seeming lack of remorse add a layer of complexity to his character.
The remaining characters are largely flat:
* General Macarthur: A rigid, authoritative figure whose primary characteristic is his military background.
* Dr. Armstrong: A seemingly kind and capable man, but he is primarily defined by his profession.
* Mrs. Rogers: A quiet, subservient woman who is largely defined by her role as the housekeeper.
* Mr. Rogers: A man of few words, his character is primarily defined by his relationship with his wife.
* William Blore: A rough, gruff man, his personality is mainly characterized by his past as a detective.
Ultimately, whether you see any of the characters as "round" is subjective. Agatha Christie's focus on plot and mystery means that character development isn't her priority.