The characters in 'And Then There Were None' are forced to make difficult choices between their own survival and the lives of others, highlighting the moral conflict between self-preservation and altruism.

Sam Spade's moral dilemma revolves around the conflict between his duty to his client and his sense of justice. He must decide whether to prioritize the client's interests, even if it means compromising his own moral values, or to uphold justice, potentially at the expense of his client's goals.

Sherlock Holmes and Dr. Watson face the moral dilemma of whether to prioritize justice or mercy in their pursuit of the criminal. They must decide whether to ensure that the criminal is punished to the fullest extent of the law or to show compassion and consider extenuating circumstances.

Guy Haines and Bruno Antony face the moral dilemma of whether to carry out a murder plot or resist the temptation. They must decide whether to succumb to their desires for revenge or to uphold their moral values and refrain from committing a heinous crime.

Philip Marlowe faces the moral dilemma of whether to prioritize his client's interests or his own moral compass. He must decide whether to compromise his values and follow his client's wishes, even if it means engaging in questionable activities, or to uphold his own sense of right and wrong.

Inspector Wexford faces the moral dilemma of whether to prioritize justice or mercy in his pursuit of the criminal. He must decide whether to ensure that the criminal is punished to the fullest extent of the law or to show compassion and consider extenuating circumstances.

Commissario Brunetti faces the moral dilemma of whether to prioritize his duty as a police officer or his personal relationships. He must decide whether to pursue the investigation impartially, even if it means uncovering secrets that could harm his friends or family, or to compromise his professional integrity in order to protect those he cares about.

Inspector Rebus faces the moral dilemma of whether to prioritize justice or mercy in his pursuit of the criminal. He must decide whether to ensure that the criminal is punished to the fullest extent of the law or to show compassion and consider extenuating circumstances.

Commander Adam Dalgliesh faces the moral dilemma of whether to prioritize his duty as a police officer or his personal beliefs. He must decide whether to pursue the investigation impartially, even if it means uncovering secrets that challenge his own religious convictions, or to compromise his professional integrity in order to protect his faith.

Alec Leamas faces the moral dilemma of whether to prioritize his loyalty to his country or his own moral values. He must decide whether to carry out a mission that he believes is morally questionable, even if it means compromising his own principles, or to defy his superiors and potentially put his life at risk.

Jimmy Marcus, Sean Devine, and Dave Boyle face the moral dilemma of whether to prioritize justice or loyalty to their friends. They must decide whether to pursue the investigation impartially, even if it means uncovering secrets that could harm their friends or family, or to compromise their pursuit of justice in order to protect those they care about.

Chili Palmer faces the moral dilemma of whether to use violence to collect the debt or find a peaceful resolution. He must decide whether to resort to violence, which could have serious consequences, or to explore alternative methods of negotiation and compromise in order to resolve the situation without resorting to violence.

Frank Chambers and Cora Papadakis face the moral dilemma of whether to prioritize their love for each other or their moral obligations. They must decide whether to pursue their romantic relationship, even if it means committing a heinous crime, or to uphold their moral values and refrain from engaging in criminal activity.

Ned Beaumont faces the moral dilemma of whether to prioritize his loyalty to his boss or his own moral values. He must decide whether to carry out his boss's orders, even if they conflict with his own sense of right and wrong, or to defy his boss and potentially put his own life at risk.

Tom Ripley faces the moral dilemma of whether to prioritize his own desires or the well-being of others. He must decide whether to pursue his own selfish ambitions, even if it means harming others, or to consider the consequences of his actions and act in a way that respects the rights and well-being of others.