It was cold standing on the hill outside Bill Dennison's cabin, and there was snow forecast which would eventually cut off the cabin from the rest of civilization for the winter, with the heavy snow drifts preventing anyone from coming to visit until the Spring. So it's quite a surprise to hear a car nearby, and soon a knock at the door from a brusque couple. They want information about a wrecked plane which crashed recently and had something on board the couple are very keen to get their hands on...