“Paula” (Ingrid Bergman) has been dating “Roger” (Yves Montand) for a while, but though she really does care for him quite deeply, the romantic spark is waning a bit and she suspects that he is playing away from home on his fairly regular business trips. She isn’t looking to change things, but when she meets the adoring “Philip” (Anthony Perkins) his naive innocence and enthusiastic attempts at courtship bring something refreshing, exhilarating even, to her own rather staid lifestyle. When she learns that “Roger” is once again up to mischief, things with the younger man take on a new dynamic…