Bill’s thoughts were far afield from his engine as he cruised along over Diamond Lake. He had about ninety-five hundred feet altitude and everything was running smoothly. There was no reason why he should think of his plane. Also there was no reason for looking for forest fires, as they had not seen any for the last twenty or thirty minutes of the flight. Bill was brought back to the business at hand with a jerk. His engine started an intermittent miss.