“The fact that someone has been put on our trail to watch us is pretty good evidence that something wrong is going on,” said Hazel. “You warned us not to be sure that anybody is guilty until we see the jam on his fist. But we can work more confidently if we are reasonably certain that there is something to work for. If this man Langford is in the employ of the Grahams and is here watching us for them, we may be reasonably certain that Aunt Hannah was right in her suspicions about the way little Glen is being treated, may we not?”