Paris in the 1950s was a magnet for the creative energies of a generation, from France and from abroad. A decade that began with Sartre holding court at the Cafe de Rore and ended on the crest of the cinematic New Wave saw the city open its arms to British and American writers, musicians and artists drawn to its postwar promise of physical, intellectual and sexual liberation. Peter Lennon charts an extraordinary decade and its legacy. Producer Sara Davies