The novel intertwines the characters’ sense of guilt or innocence with the theme of appearance versus reality. When the guests first arrive on the island, each one professes their innocence. Some even claim their alleged crimes were simply accidents. Tony Marston refers to the deaths of John and Lucy Combes as “beastly bad luck.” Dr. Armstrong’s involvement in Louisa Clees’ death, resulting from his drunkenness during surgery, is also labeled as accidental. However, their responses to these so-called accidents vary. Marston denies any responsibility, his lack of morals deepening his culpability. On the other hand, Armstrong privately acknowledges his part in his patient’s death but is unable to confess it openly. Lombard maintains his innocence through his amoral outlook and racism, justifying his actions by stating his survival was more important than that of the natives. Christie adds complexity to the issue of guilt and innocence, especially concerning Wargrave. Is the judge guilty of killing ten people, or is he merely executing his judicial duties? His motivations, as revealed in his confession, imply his guilt.