Survivors (1975)

Season 2: Episode 13

There is a much excitement when a balloon passes over Whitecross. However, when the balloon comes down and its occupant is found dead a mystery is left behind. The man is discovered to be a Norwegian and he has in his possession various items that suggests he has been mapping the nation's settlements. When Melanie and Alan meet one of the ballonist's acquaintances, Seth, they learn that the man had been travelling with his daughter Agnes. When Agnes eventually arrives at Whitecross things will never be the same again for our survivors...