Jill and Eustace gave one glance at each other， dived under the laurels， and began scrambling up the steep， earthy slope of the shrubbery at a speed which did them great credit. （Owing to the curious methods of teaching at Experiment House， one did not learn much French or Maths or Latin or things of that sort； but one did learn a lot about getting away quickly and quietly when They were looking for one.）After about a minute’s scramble they stopped to listen， and knew by the noises they heard that they were being followed. “If only the door was open again！” said Scrubb as they went on， and Jill nodded. For at the top of the shrubbery was a high stone wall and in that wall a door by which you could get out on to open moor. This door was nearly always locked. But there had been times when people had found it open； or perhaps there had been only one time. But you may imagine how the memory of even one time kept people hoping， and trying the door； for if it should happen to be unlocked it would be a splendid way of getting outside theschool grounds without being seen.
