Putting aside gnawing doubts about her marriage, Margaret continues with her plan to secure her claim to Inveraray Castle. But a private photograph has the potential to destroy everything she has ever worked for and fuel the fire of one of the most scandalous divorce trials in British history.

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.