Biggles and the Blue Moon

“I’m not going to pretend to be optimistic about it, but until we know for certain that he won’t be coming back, I shall assume that he will. That is how we work. When a plan, or an arrangement, is made, neither side departs from it until proof positive is apparent to make a change imperative. What happened to Biggles we don’t know. He may have been captured or killed; but until we know that for certain, I shall carry on as if nothing had happened. Biggles, if he is alive, will rely on that.”