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Rh Vandemeyer lay perfectly passive with closed eyes. He shook his head.

"Well," said Tuppence, with an attempt at cheerfulness, "we must wait until the morning, that's all. But I don't think we ought to leave the flat."

"What about leaving that bright boy of yours on guard?"

"Albert? And suppose she came round again and hooked it. Albert couldn't stop her."

"I guess she won't want to make tracks away from the dollars."

"She might. She seemed very frightened of 'Mr. Brown.

"What? Real plumb scared of him?"

"Yes. She looked round and said even walls had ears."

"Maybe she meant a dictaphone," said Julius with interest.

"Miss Tuppence is right," said Sir James quietly. "We must not leave the flat—if only for Mrs. Vandemeyer's sake."

Julius stared at him.

"You think he'd get after her? Between now and to-morrow morning. How could he know, even?"

"You forget your own suggestion of a dictaphone," said Sir James dryly. "We have a very formidable adversary. I believe, if we exercise all due care, that there is a very good chance of his being delivered into our hands. But we must neglect no precaution. We have an important witness, but she must be safeguarded. I would suggest that Miss Tuppence should