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.
A comic tale of eccentric Michael Sleep (Pearce Quigley) who, since his darling Clea disappeared seven years ago, has lived a very ordinary life. He eats Shreddies, works in a DIY store, visits dad Brian (Michael Palin) and hopes for Clea to return. That