Trixie and Sister Mary Cynthia team up to support a deaf mother-to-be, while a case of morning sickness proves more serious than initially suspected. Elsewhere, Fred's daughter is less than delighted about his forthcoming wedding.
Christmas is coming and in Poplar the nuns and midwives of Nonnatus House are busier than ever. When an abandoned baby is discovered on the steps of the convent, the whole community rallies round to provide food and clothing and to try and trace his mother. Who would be desperate enough to do such a thing?
The maternity home sees two school friends reunited and their lives become intertwined in the most unexpected way. Elsewhere, Barbara and Sister Mary Cynthia team up to implement a revolutionary technique on their bedsore patient before it is discovered that it is his steadfast wife who is the one most in need of care.