Sir Hallam finds himself at the centre of a national crisis when his friend, the Duke of Kent, asks for help. Meanwhile, storm clouds are gathering within 165 Eaton Place, with Lady Agnes's growing fear over the imminent arrival of her baby, and the servants' concern for Lotte, who refuses to speak. But, as the king finally abdicates, Hallam makes a discovery that will change his life forever.

Writing:

• Heidi Thomas

Stars:

• Jean Marsh
• Ed Stoppard
• Ellie Kendrick

Metacritic: 7.7/10
TMDb: 7.4/10