"I say, Eric," he exclaimed breathlessly. "If you've a chance there's my best umbrella on the beach. Don't forget it, if you can help it, there's a good lad."

And having eased his mind on that point, he wended his way to the Bantyre Hotel.

CHAPTER VI

AN EXCELLENT NIGHT'S WORK

"There's the cottage, sir," whispered one of the guides, pointing to a dark object silhouetted against the starlit sky.

The sub. halted his party and called them to attention. Six of them with the A.P., were to accompany him to the house; the others, under the command of the midshipman, were to form a cordon round the building and also to establish communication with the boats when the crucial time arrived.

Stealthily Tressidar approached the window through which Mr. Greenwood had effected his escape. The casement was ajar. He opened it and drew the curtain aside the fraction of an inch. The room, still lighted, was deserted. Signing to his men to remain, he stole quietly through the window and approached the trap-door leading to the tunnel. He could detect the fumes of petrol. With the burning lamp the cottage was in momentary peril of being blown up by the ignition of the air and volatile spirit with which it was so highly charged. Either the occupier was a madman or a fool, he argued.

Unbarring and unlocking the door, Tressidar brought his men into the room. Extinguishing the lamp, he switched on his electric torch and led the way down the ladder to the tunnel.

Contrary to his expectations, the descent was effected without any of the seamen stumbling, dropping their rifles, or making a noise that would betray their presence. In silence the men awaited their officer's next order, which was given by signs.