The man drove along rapidly, and in about an hour had reached the outskirts of Denville. He turned down a road that was evidently little used, to judge by the grass growing in it, and halted the horse in front of a small building. It did not look like a place where inventors' models would be made. In fact the shack had a forlorn and forsaken air about it, and Joe looked curiously at it. His suspicions were coming back.