All her life, Mrs Foster had had an almost pathological fear of missing a train, a plane, a boat, or even a theatre curtain. In other respects, she was not a particularly nervous woman, but the mere thought of being late on occasions like these would throw her into such a state of nerves that she would begin to twitch. It was nothing much – just a tiny vellicating muscle in the corner of the left eye, like a secret wink – but the annoying thing was that it refused to disappear until an hour or so after the train or plane or whatever it was had been safely caught.