It was part-way open and the round good-natured face of Tom Barnum, filled now with anxiety, was framed in the opening. Tom was the mechanic-watchman. He beckoned, and the boys tiptoed across the room and into the power house, closing the door behind them. Old Davey, caretaker at the Hampton home, stood there, wringing his hands. "What is it? What's the matter?" Frank Merrick asked sharply.