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.

The nineteenth century saw not only a widespread interest in philosophical ideas but also philosophy’s development as a more rigorous discipline. Australian philosopher Peter Singer introduces us to the highlights of a century of philosophy books.

“Do not ask who I am and do not ask me to remain the same,” wrote Michel Foucault; a brilliant transdisciplinarian whose work spanned philosophy, history, social theory and literary criticism. He mined past ways of thinking so as to see present-day assumptions and practices afresh, explains the philosopher Gary Gutting.

Few people have had their ideas reinvented as many times as the German intellectual and political activist, Karl Marx. Professor of political theory, Terrell Carver, takes us through the most influential books, in English, about Marx, Marxism and his friend, publicist and financial backer, Friedrich Engels.

The concept of ‘race’ is misleading and inaccurate, says the veteran broadcaster Kurt Barling. Here he recommends the best Five Books on racism, and reveals what he said to Enoch Powell when they came face to face.

What are human rights? Are they reducible to the rights enshrined in law or do they somehow objectively exist? Philosopher John Tasioulas picks the best five books on human rights.

He was one of the great intellectuals of the 20th century, but a people person with little interest in publishing books. Henry Hardy, the editor who helped publish many of them, chooses the best books by (and one about) Isaiah Berlin.

The philosopher argues that a culture of debate, in which people of all backgrounds can openly discuss the truth, is philosophy’s real answer to conflict.

British philosopher Jonathan Wolff chooses five books by thinkers who have shaped the field. He explores the experiences that influenced each writer, saying ‘it’s very rare for philosophers to say very much about their history and what brought them to the views they have’.

The feminist author chooses liberating literature for women, from Virginia Woolf to Erica Jong. She says that men still don’t share equal responsibility in the home, and that life after divorce can be easier.

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

The US Supreme Court Justice, Stephen Breyer, talks about the books that have influenced his thinking. He explains why reading widely, including literature, is essential for judges and lawyers.

Historian Eric Foner chooses five books illustrating how concepts of American liberalism have changed over the past 50 years, and about the tension that lies at the heart of liberalism today.

Is it inevitable that the desire to build a perfect world should end in disaster? John Gray considers the flaws in utopian thinking and the essential nature of humans. He recommends the best critiques of utopia and apocalypse.

What is the difference between fairness and equality? In contemporary capitalist societies, some inequality is inevitable and desirable. But the rewards for the few at the top have soared while the rest have been squeezed. Is this fair? We need a new social contract, says the author and columnist

From Tunisia to Tahrir, Moscow to Manhattan, civil resistance is back. The British Academy president, and eminent student of people power, tells us how modern non-violent action began, and where it’s most likely to succeed

Our weekly series on American progressivism continues with the journalist and author discussing the genesis of liberalism – and how the Civil War remade politics

Esteemed historian of the Soviet Union recommends five books on Communism, from novels and personal narratives to theoretical works.

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”

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

The chairman of the Equalities & Human Rights Commission says discrimination and social injustice won’t be changed by what happens in courtrooms or parliament but by how we all behave

The lawyer who prosecuted Ariel Sharon discusses the brilliance of maverick political thinkers and says: “It takes at least a generation to establish democracy.” Highlights work of philosopher Gilles Deleuze above all

Toleration is an ideal of conduct which involves putting up with something you find objectionable, says Professor Timothy Stanton. He chooses the best five books on toleration, from John Locke to more recent works.

Political scientist Gary Bass picks the five best books on Human Rights.