T. B. shook his head.

"I should think that was unlikely. I suspect our friend Poltavo of having carried out this little coup entirely on his own. I further suspect his having brought the car in this direction with no other object than to throw suspicion upon our worthy friends across the hill—and how did you come to the outhouse?"

"I was dead beat," explained Frank. "I had a sudden spasm of strength which enabled me to out-distance those people who were pursuing me, but after I had shaken them off I felt that I could drop. I came upon this cottage, which seemed the only habitation in view, and after endeavouring to waken the occupants I did the next best thing, I made my way into the coachhouse and fell asleep."

T. B. had no misgivings so far as this story was concerned; he accepted it as adding only another obstacle to the difficulties of his already difficult task.

"You heard no sound whilst you lay there?"

"None whatever," said the young man.

"No sound of a struggle, I mean," said T. B., and then it was that he explained to Frank Doughton the extraordinary disappearance of the owner of Moor Cottage.

"She must be in the house," said Frank.

They went back and resumed their search. Upstairs was a bedroom, and adjoining a bath-room. On the ground floor were two rooms: the study he had quitted and a smaller room beautifully decorated and containing a piano. But the search was fruitless; Lady Constance Dex had disappeared as though the earth had opened and swallowed her up. There was no sign of a trap in the whole of the little building, and T. B. was baffled.

"It is a scientific axiom," he said, addressing Ela with a thoughtful glint in his eye, "that matter must occupy space, therefore Lady Constance Dex must be in existence, she cannot have evaporated into thin air, and I am not going to leave this place until I find her."