'The question Eilenberger sets out to answer in this ambitious, enthralling book: what use is philosophy in the middle of a war?' (The Sunday Times)The year is 1933. Hannah Arendt escapes Berlin, seeking refuge among the stateless gathering in Paris. Simone de Beauvoir reimagines the dance between consciousness and the world outside in a Rouen café. Ayn Rand labours in Hollywood exile on the novel she believes destined to reignite the flame of liberty in her adoptive nation. Simone Weil, disench...