The Duke of Frome John Langton with his wife, their baby born after complications during childbirth, a domineering nanny, nursery maid and valet arrive at Montague Hall for Lady Felicia's Yuletide ball. During the evening the baby is taken from his cot. Inspector Mallory suspects an inside job by the valet when his secret wife arrives while Brown is more interested in the birth of the baby at a home for unmarried mothers. Mrs McCarthy under pressure from the diocese to provide a Christmas service fit for a Duke receives unexpected help from a vagrant she finds in the confessional.“海彤和Ａ市君家的大少奶奶来往密切，君家大少奶奶有个养子，那个养子跟海彤的外甥玩得很好，若是有一天，你能看到君家大少奶奶的养子了，想办法把他拐出来见我。”