This time we're in England in the 1940s, and recently widowed Madge Arwell hasn't told her children, Lily and Cyril, that their father has died flying his bomber home over the channel, because she doesn't want Christmas to become the day that broke their hearts.

But when they're evacuated to a draughty old house in Dorset for the holidays, and meet a mysterious young caretaker in a bow tie, events take an unexpected turn. What could be inside that big blue parcel under the tree?

BBC One - Christmas Day, 6.30pm