Note 21
"I suppose 'Sixty Days to Live' should have a sequel, but having tied all the couples up so neatly that might prove a little difficult ... ... ... ... ... ... ... ... I am sorry that you felt that I had left the characters rather in the air, but I felt that having got them out of an apparently impossible situation I had done my bit by readers, and after all they were left flying south, south, south to the sunshine which is surely an implication in the best tradition that they all live happily ever afterwards."

Letter to L.E.L Downing, 13th December 1939