The midwives return to deal with all the problems 1950s London can throw at them as this award-winning drama continues. A very old and dirty woman dressed in rags is fascinated by the newborns, much to the disgust and fear of the mothers. But is there more to this woman that anyone realises? When a baby is abandoned at Nonnatus House at Christmas, the nuns wonder who would be desperate enough to do such a thing. And word soon spreads that Dr Turner is trialling the latest pain killer - gas and air. It's not long before all the women want a taste of it.