midnight
`` Perhaps you do n't believe I saw anything at the window , '' replied Will , somewhat indignantly . `` Oh , I do n't doubt that you think you saw something at the window . '' Will seized a searchlight , grabbed Tommy by the shoulder , and pulled him out of the door and around to the north side of the cabin . The boys were not dressed especially for a midnight excursion in the snow , and their teeth chattered as they made their way against the chilling wind . However , they stuck to their purpose and soon stood under the window which Will had pointed out . '' `` There ! '' the boy exclaimed in a triumphant tone .