“Mr. Shei wins this time,” he frankly acknowledged, “but he will lose in the end. The Gray Phantom was never beaten yet. I wish you good-night, gentlemen.”

With that he was out of the door and running swiftly down the hall. With a cry of rage Slade sprang from the chair and started in pursuit, blowing a pocket whistle as he ran. Men appeared from every direction, and Slade shouted orders that the house and grounds be thoroughly searched at once. The men scattered, and in a few moments the search was on.

But The Gray Phantom, safe in his hidden chamber, was already at work on the details of his next move.

[CHAPTER XVII—DOCTOR TAGALA’S DISCOVERY]

A glance at his watch as he entered the secret room showed The Phantom that daybreak was not far away. In a little while it would be highly unsafe for him to walk about the house; besides, the execution of his next move depended for its success on darkness and quiet. To jeopardize his project by a reckless move would be the height of folly and might result in disastrous consequences. Much as his fears and anxiety urged him to immediate action, The Phantom decided to wait till the following night.

He lay down on the cot and slept by snatches. Now and then, as a faint but terrifying sound came down the ventilator shaft, he awoke with a start. Peals of unnatural laughter, sounding remotely in the darkness of the hidden chamber, started a cold sweat on his forehead. By sheer physical force he would shut out the sounds, knowing that for the present he could do nothing, but the mutterings that fell from his lips and the convulsive clenching of his hands boded no good for Mr. Shei and his followers.

Morning came, and he tried to fix his mind on his forthcoming move. A grim look came into his face as he contemplated the step he was about to take. Ordinarily he would have shrunk from it in disgust, for it was an expedient he had never employed in the past. Now, however, with the life of Helen Hardwick in danger, he must employ whatever means might prove effective. It was no time for niceties or scruples. Besides, there was no reason why he should be restrained by ethical considerations when dealing with blackguards like Mr. Shei and his retainers.

The hours dragged. A troubled look on his face, The Phantom paced the floor of the narrow chamber. His plans for the night were complete except for one detail. Cudgel his brain as he might, there was one small but important matter that continued to puzzle him. Evening came, and the solution of the difficulty still eluded him. He was a little faint from hunger, for he had not eaten for twenty-four hours, and he wondered if his brain would not work better after a visit to the pantry. In a little while the house would quiet down for the night, and then he could safely leave his hiding place.

At last he was ready for action. He gave his automatic a careful inspection. Into his pocket he put a coil of thin but strong rope which he had unearthed from an old chest. Then he turned off the light and ascended the spiral stairway. After listening in vain for sounds, he tiptoed out in the hallway, then down the main stairway. The entire house seemed immersed in sleep, and even the strained laughter had stopped for a time. Evidently the occupants of the house, never guessing that he was hiding in their very midst, supposed that The Gray Phantom had left Azurecrest.

He felt more alert after gratifying his hunger in the well-stocked pantry. By the back stairway he returned to the second floor. Silent as a shadow he walked down the hall, pausing briefly before every door and listening. It was important that he should locate Doctor Tagala’s room, for his whole plan revolved around the scientist. Also, he was anxious to take the doctor completely by surprise.