“They were an odd pair. Albert Camus was French Algerian, a pied-noir born into poverty who effortlessly charmed with his Bogart-esque features. Jean-Paul Sartre, from the upper reaches of French society, was never mistaken for a handsome man. They met in Paris during the Occupation and grew closer after the Second World War. In those days, when the lights of the city were slowly turning back on, Camus was Sartre’s closest friend. ‘How we loved you then,’ Sartre later wrote. They were gleaming icons of the era. Newspapers reported on their daily movements: Sartre holed up at Les Deux Magots, Camus the peripatetic of Paris. As the city began to rebuild, Sartre and Camus gave voice to the mood of the day. Europe had been immolated, but the ashes left by war created the space to imagine a new world. Readers looked to Sartre and Camus to articulate what that…