had been given no alternative, and Miss Norris, who had proposed to catch an after-dinner train at the junction, in the obvious hope that she might have in this way a dramatic cross-examination at the hands of some keen-eyed detective, was encouraged tactfully, but quite firmly, to travel by the earlier train with the others. Antony had felt that Cayley, in the tragedy which had suddenly befallen the house, ought to have been equally indifferent to her presence or absence. But he was not; and Antony assumed from this that Cayley was very much alive to the necessity for her absence.
Why?
Well, that question was not to be answered off-hand. But the fact that it was so had made Antony interested in her; and it was for this reason that he had followed up so alertly Bill's casual mention of her in connection with the dressing-up business. He felt that he wanted to know a little more about Miss Norris and the part she had played in the Red House circle. By sheer luck, as it seemed to him, he had stumbled on the answer to his question.
Miss Norris was hurried away because she knew about the secret passage.
The passage, then, had something to do with the mystery of Robert's death. Miss Norris had used it in order to bring off her dramatic appearance as the ghost. Possibly she had discovered it for herself; possibly Mark had revealed it to her secretly one day, never guessing that she would make so unkind
