Should you feel responsible for helping the world become better? And if so, how should you use your time, money, and career to have the biggest possible impact? These are the questions addressed by the effective altruism movement. One of its leading figures, Will MacAskill, recommends the best books to answer them.

If killing is wrong, how can going to war be justified? Is it always wrong to kill civilians? If a Nazi soldier were billeted in your home, should you respond when he greets you? Philosopher Cécile Fabre chooses Five Books that help explore the profound ethical dilemmas of war.

Aristotle, says Edith Hall, is “quite simply the most important intellectual who ever lived.” Here the author and classicist selects five key texts to further your understanding of the great philosopher's life and work.

The study of philosophy in the Western world is often parochial, and limited to the study of the Anglo-European tradition. It’s time to widen our focus, advises the author and philosopher Bryan Van Norden. Here he selects five foundational texts of philosophical traditions worldwide.

Why do apparently ‘good’ people sometimes behave deplorably? Christian B Miller, professor of philosophy at Wake Forest University, selects five books that explore the subject of moral character and warns us to be cautious of making inferences about the underlying motives of others – and ourselves.

Many philosophical theories try to evade the uncomfortable truth that luck and fate play a role in the conduct of our moral lives, argues philosopher Paul Russell. He chooses the best books on free will and responsibility.

Advances in artificial intelligence pose a myriad of ethical questions, but the most incisive thinking on this subject says more about humans than it does about machines, says Paula Boddington, Oxford academic and author of Towards a Code of Ethics for Artificial Intelligence.

Given the choice between allowing five people to die, and killing one person, what would you do? What is the utilitarian argument for vegetarianism? Should we be able to sell our kidneys? The philosopher suggests some answers and picks the best books on ‘ethical problems.’

What does it mean to be an ethical meat-eater? Author and journalist Louise Gray chooses five books that examine the impact of our omnivorous lifestyle, and explains why she spent a year only eating the animals she had killed herself.

Adam Smith tends to be seen as the founder of capitalism and modern economics, but he was, first and foremost, a moral philosopher. Dennis Rasmussen, author of The Infidel and the Professor—a book about Smith’s friendship with David Hume—selects the best books by and about Adam Smith.

The term ‘eugenics’ elicits queasiness amongst those who associate it with the Nazis. But Winston Churchill, George Bernard Shaw and Margaret Sanger were among its many proponents in the interwar period. Why? Philippa Levine, professor of history at the University of Texas, explains.

The introduction of drones “makes possible perpetual war without costs”, warns the anthropology professor and security expert Hugh Gusterson. Here he selects the best books that examine their ethical, psychological and political impact upon 21st century warfare.

The Professor of History outlines how our understanding of deceit has changed: from a devilish sin in the Middle Ages, to a social necessity in the Enlightenment

Which comes first, morality or religion? And what happens when religious dogma clashes with the morality it purports to uphold? British philosopher Mary Warnock recommends the best books on morality without God.

The Princeton philosophy professor tells us about the meaning of honour, how it’s won and lost, and what role it has played in the history of moral change

How should we live? The philosopher tells us about some of those who’ve looked for answers, from Plato to Primo Levi. He picks the best books on moral philosophy.

British philosopher Edward Skidelsky tells us about virtue from Plato to the modern day, and says Jane Austen got it right when she wrote about passion

Tortured by the sins of your past? Or contemplating new ones? The historian of ancient Christianity recommends five books you to understand the role of sin in Christian thought.

What does a moral life entail? How does one achieve it? Philosopher AC Grayling picks the best books on “being good.”

The lawyer, who’s defended many clients on death row, tells us why the legal system in capital cases is set up to fail, and says all of us should know more about what happens in an execution

Religion is often presented as the guardian of moral values. The problem with this, says the author and broadcaster, is that it diminishes what it means to be human. He picks the best books on morality without God.

Can torture ever be justified? No, says the UN special rapporteur, who tells us how torturers try to excuse themselves and what remedies should be available to surviving victims

As both a solicitor advocate and literary scholar, Anthony Julius occupies a privileged place to navigate complex interactions between literature and law. He picks the best books on censorship, including three novels subjected to their own censorship controversies.

The former United Nations High Commissioner for Human Rights and President of Ireland picks the best books to read on climate justice.

The Hoover Institution scholar explores five books that he believes teach us something about how we are “failing to understand, appreciate and defend our liberty”

The author of Torture and Democracy gives a harrowing interview on the effects of violence, torture and trauma on the human being, ‘torture has a slippery slope and once you authorise it, it rapidly runs out of control’

Bestselling author, Adam Haslett, defines the existential origin of evil as the refusal to acknowledge and confront our own mortality. He picks the best books on evil.

The Lib Dem peer says that reading Cicero’s speeches, George Eliot’s novels and Gerard Manley Hopkins’s poems can help us manage the ethical dilemmas of our own historical moment, and provide clues to human nature

Lindsay Porter, author and cultural historian who has published widely on conspiracy theories, discusses five books on the different concepts of politically motivated killing and asks whether assassination can ever by justified

When reading books, we often empathize with a main character and find redemption in our emotional response to their fate. But it's more important to think, says Bosnian novelist Aleksandar Hemon. Here, he picks the best books on 'man's inhumanity to man.'

The author and activist talks about medical ethics and selects her five top books on the subject. She raises questions as to whether we own our bodies, and the ethics behind selling human organs.