I could see how his hand was trembling on the arm of his chair, and he paused a moment to collect himself.

“What Miss Vaughan told me,” he went on, at last, and I saw that of the details of the meeting he did not intend to speak, “convinced me that her father was quite mad—­much worse than I had suspected.  I knew, of course, that he was a student of the supernatural, but since the coming of this yogi....”

“This what?” Hinman interrupted.

“A yogi,” Swain answered, turning toward him, “is, as nearly as I can make out, a sort of high priest of Hinduism.  He knows all its secrets, and is supposed to be able to do all sorts of supernatural things.  This fellow who lived with Mr. Vaughan is a yogi.  Mr. Vaughan was his disciple.”

“Where did the yogi come from?” Godfrey asked.

“I don’t know.  I don’t think Miss Vaughan knows.  He arrived, with his attendant, about six months ago; and since then things have gone from bad to worse.  There has been crystal-gazing and star-worship and necromancy of all sorts.  I confess I didn’t understand very much of it,” he added.  “It was all so wild and weird; but it ended not only in Mr. Vaughan’s becoming a convert to whatever religion it is the yogi practises, but in a determination that his daughter should become a priestess of the cult.  It was from that she wished me to help her to escape.”

He stopped and again rubbed his head slowly.

“As I tell it,” he went on, at last, “it sounds absurd and unbelievable; but as she told it, there in the darkness, with those strange rustlings round us, it sent the chills up and down my spine.  Perhaps those Orientals do know more about the supernatural than we give them credit for; at any rate, I know that Miss Vaughan had been impressed with the yogi’s power.  It fascinated and at the same time horrified her.  She said he had a hideous snake, a cobra, which he petted as she would pet a kitten....”

His voice broke off again, and he wiped the perspiration from his forehead.  I myself felt decidedly nervous.  Godfrey threw away his cigar, which had broken in his fingers.

“At any rate,” Swain went on, “I was so upset by what she told me that I could think of nothing to do except to beg her to come away with me at once.  I remembered my promise to you, Mr. Lester, but I was sure you would approve.  I told her about you—­that it was into your hands the letter had fallen.  She said she had seen you looking at her from a tree and had known at a glance that she could trust you.  You didn’t tell me you were in a tree,” he added.

“Yes,” I said, awkwardly.  “I was just taking a little look over the landscape.  Rather foolish of me, wasn’t it?”

“Well, it was mighty fortunate, anyway.  She had written the letter, but she had no idea how she was going to get it to me.”

“You mean she couldn’t go out when she wanted to?” demanded Godfrey.