Twins have been a common theme in horror films and macabre master David Cronenberg tackles the topic here. Elliot and Beverly Mantle (Jeremy Irons, A REVERSAL OF FORTUNE) are identical twin gynecologists. Beverly is the shy, scholarly scientist, who developed a revolutionary surgical instrument when he was a student at college. Elliot is a flashy ladies man, who serves as the public face for Beverly’s work.
One day, actress Claire Niveau (Geneviève Bujold, THE HOUSE OF YES) comes to see Beverly at his office to see if she can get pregnant. During the examination, Elliot switches places with Beverly and seduces Claire. When Elliot gets bored of Claire, he hands her over to Beverly again. Beverly falls in love with Claire, who is quite disturbed when she finds out about Elliot.