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“The same blood flows through our veins Charlie,” murmurs Uncle Charles to his niece, their inseparable connection drawn right down to their parallel names. It is an image of duelling doubles, male and female, each of whom perform mirrored movements in perfect synchronicity, and yet serve no narrative purpose other than underscoring that darkly fated relationship at the centre of Shadow of a Doubt.
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In this story of serial killers and sinister secrets, there is an eerie motif of ballroom dancers twirling and waltzing in tight formations that Alfred Hitchcock frequently cuts to in the midst of thrilling developments.
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