Frank and Mary are planning their upcoming nuptials, but Lady Arabella is determined not to give up without a fight.
She manages to persuade Mary that marrying Frank would be a selfish thing to do, but will Mary be convinced that if she truly loves him, she'll set Frank free?
Meanwhile, Louis is drinking too much and struggling with his unpopular position in society not to mention Mary's rejection. Will he pull himself together in time for dinner with the Greshams?
Doctor Thorne, ITV, 9pm
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