Howard Hawks’s 1939 film represents the equilibrium point of his career: the themes he was developing throughout the 30s here reach a perfect clarity and confidence of expression, without yet confronting the darker intimations that would haunt his films of the 40s and 50s. The setting is a South American port where a group of fliers, led by Cary Grant, challenges the elements nightly by piloting mail across a treacherous mountain range. This all-male existential ritual (Grant almost seems the high priest of some Sartrean temple) is invaded by an American showgirl (Jean Arthur) who stops off for a steak and remains, fascinated by the heightened, heady atmosphere of primal struggle. The film’s moral seriousness (which sometimes approaches overt didacticism) is balanced by the usual Hawks humor and warmth, and as Grant and Arthur are drawn into a romance, the film moves toward a humanistic softening of its stark premises.