Midnight
`` Let her go ! '' cried Tom as he turned on more gasoline and further advanced the spark of the motor . The roar increased , the propeller looked like a solid circle of wood , and the trim little monoplane moved slowly across the rising ground , increasing its speed every second , until , like some graceful bird , it suddenly rose in the air as Tom tilted the wing tips , and soared splendidly aloft ! A Midnight Intruder Tom Swift sent his wonderful little craft upward on a gentle slant . Higher and higher it rose above the ground . Now it topped the trees ; now it was well over them . On the earth below stood Mr. Swift , Mr. Jackson , Eradicate and Mrs. Baggert .