The Duke of Rochester marries Lady Isobel Drummond in order to obtain an heir. She marries him to save her family from financial ruin but also because she's fallen in love with the dissolute duke. Alexander, Lord Bentley, realises how much he loves his wife after he has driven her away by his objectionable behaviour. Can he convince Isobel he is a changed man? Can Isobel forgive the man she once loved?