The Devil with Seven Faces

In this 1971 Italian giallo thriller, a serpentine plot unfolds as two identical twins, Julie and Mary, find themselves entangled in a web of mistaken identity and revenge. When Julie is stalked by a mysterious stranger in Amsterdam, she confides in her lawyer Dave Barton about her sister's life being threatened in London - where Mary has stolen a massive diamond from a Maharaja, sparking a heist that will leave no one unscathed.