"And if you were an Epsilon," said Henry, "your conditioning would have made you no less thankful that you weren't a Beta or an Alpha." He put his forward propeller into gear and headed the machine towards London. Behind them, in the west, the crimson and orange were almost faded; a dark bank of cloud had crept into the zenith. As they flew over the crematorium, the plane shot upwards on the column of hot air rising from the chimneys, only to fall as suddenly when it passed into the descending chill beyond.