The marvellous medics are challenged like never before this week as they face two rare cases.
First up, a Nigerian man causes panic when he goes into hiding with what he, and everyone else, fears is a deadly case of smallpox.
Thankfully, lovely Reggie is back for a visit and both he and Sister Monica Joan bond with the terrified man.
Meanwhile, Lucille does her best to help a pregnant woman who, due to the traumatic delivery of her first baby, now has a severe phobia of giving birth.
There’s light relief, though, as busy bees Vi and Fred organise the annual Poplar Picnic, while there are smiles all round as two much-loved Nonnatus House favourites return to join in