"Sam!" No answer. "I say, Sam, can't you listen for just a moment?" "Oh, Tom, please don't bother me now!" and Sam Rover, with a look of worry on his face, glanced up for a moment from his writing-table. "I've got to finish this theme before to-morrow morning." "Oh, I know! But listen!" And Tom Rover's face showed his earnestness. "Last night it was full moonlight, and to-night it is going to be equally clear. Why can't we get out the auto and pay a visit to Hope? You know we promised the girls that we would be up some afternoon or evening this week."