Mércedès, an actress from Paris attempts to break off a difficult relationship with the jealous and possessive stalker Johnny. She meets newspaper writer Pierre and goes with him for an afternoon fling. Before the sweat even dries, she finds herself hopelessly in love with him. But soon after their affair begins, he is called off on a business trip leaving the suddenly distraught Mércedès alone. Though preparing for a new play, she is unable to concentrate and barely able to function. Mércedès quits the production, locks herself in Pierre's apartment and quietly begins falling apart, collapsing into a bleak, reclusive madness until his return.