The publication of *Reading Capital* —by Louis Althusser, Étienne Balibar, Roger Establet, Pierre Macherey, and Jacques Rancière—in 1965 marked a key intervention in Marxist philosophy and critical theory, bringing forth a stunning array of concepts that continue to inspire philosophical reflection of the highest magnitude. *The Concept in Crisis* reconsiders the volume’s reading of Marx and renews its call for a critique of capitalism and culture for the twenty-first century. The contributors—who include Alain Badiou, Étienne Balibar, and Fernanda Navarro—interrogate Althusser’s contributions in particular within the context of what is surely the most famous collective reading of Marx ever undertaken. Among other topics, they offer a symptomatic critique of Althusser; consider his writing as a materialist production of knowledge; analyze the volume’s conceptualization of value and crisis; examine how leftist Latin American leaders like Che Guevara and Subcomandante Marcos engaged with Althusser and *Reading Capital* ; and draw out the volume’s implications and use for feminist theory and praxis. Retrieving the inspiration that drove Althusser’s reinterpretation of Marx, *The Concept in Crisis* explains why *Reading Capital* ‘s revolutionary inflection retains its critical appeal, prompting readers to reconsider Marx’s relevance in an era of neoliberal capitalism. Contributors. Emily Apter, Alain Badiou, Étienne Balibar, Bruno Bosteels, Adrian Johnston, Warren Montag, Fernanda Navarro, Nick Nesbitt, Knox Peden, Nina Power, Robert J. C. Young