kept all three dates on the same night. She walked through the trees in this vicinity with me. She also drove down the road in the auto with one of my detectives, and she went dancing with the other. She was in three places miles apart at one and the same time.
"We each brought her home within a half hour of the other and we are swearing to that. Either we are all hypnotized or else there are three identical Misses Jouret.
"Jouret himself treats us all wonderfully, gives us the run of the house, and tries to talk us to death."
THE strange document was subscribed by Lees and the two detectives and was held by Ferguson pending developments.
The next report from Lees read:
"I had a chance to prowl around the Jouret house a little while waiting for Miss Jouret to dress. I met her twice in my ramblings and a few minutes later she met me again, this time in a different costume.
"I got a chance to search the woods back of Jouret's house in the evening. I found a spot where the earth had been disturbed, and dug up a pair of shoes. They were number nines."
A fourth report from him read:
"We found the body of the crazed engineer. He had drowned himself in a lake. This eliminates him as a murder suspect."
TWO weeks passed with no new developments in the "Invisible Death" case except for the arrival of a letter demanding $1,000,000 and threatening the life of Perkins Ferguson if the demand was ignored. It was ignored, and only served to spur Lees and his detectives on to decisive action.
They decided to rush the Jouret house and kidnap Jouret with the idea of holding him until he agreed to explain the presence of the number nine shoes buried back of his house.
A low moon hung over the poplars when Lees rang the Jouret front door bell. One detective was guarding a side door and the other a back door.
Suddenly Jouret was seen to jump from a second-story window. As he did, a car driven by one of his Porto Ricans came along the drive and he leaped into it. Lees, first to see Jouret, called his detectives. They came running. Their car was waiting in the road.
The Porto Rican was seen to jump from the Jouret car just as it started south towards New York.
Lees took up the race. Both cars had plenty of power, but the Jouret car suddenly disappeared as a low humming noise began to break the stillness of the night.
One of the detectives was at the wheel. Lees, as usual, was giving orders:
"Keep close to that hum. Never mind that you cannot see the car. It is there all right. If you can gain on it enough, drive right into it."
"Righto!" shouted the detective. "We're wise to him now."
The humming noise was taking on speed with every second. So was Lees' car. Soon Lees' car was making sixty miles an hour with the hum just ahead and barely audible.
Past traffic lights, over bridges and grade crossings the mad chase of the phantom continued.
Wildly racing through the night, missing other cars by a breath, the big, visible auto continued its pursuit of—what?
Careening, Lees' car rounded a curve, and, above the hum just ahead, they heard the shouted curses of their quarry. But he could not be seen. Lees could only see the road marked by his lights.
Mile after mile the wild, uncanny chase of the phantom continued.
SOON the lights of New York could be seen in the distance. The cars were forced to slow down somewhat. Suddenly there was a thundering crash
