Heiress Margaret Sweeny is in the midst of a divorce when she meets the dashing (and married) Ian Campbell, future Duke of Argyll.
Putting aside gnawing doubts about her marriage, Margaret continues with her plan to secure her claim to Inveraray Castle.
Battlelines are drawn as the Duke and Duchess of Argyll enter into a bloody separation, all played out in the white-hot glare of a ravenous press.
Claire Foy
Margaret Campbell
Paul Bettany
Ian Campbell
Julia Davis
Maureen Guinness
Richard McCabe
George Whigham
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