The winters are cold in Norway, and the afternoon of 16th December, 1972 was no different: the wind howled, the snow crunched underfoot and sun had long dipped below the horizon. It was a Saturday evening but you wouldn’t know it. Most of the town had battened down the hatches for another freezing night, but in the cellar of a small house the hum of a television could be heard behind the flicker of the fire.