Then came the dull thud of a heavy stone slab falling into position, and Fordyce and the petty officer found themselves prisoners in the cellar of the mysterious house.

CHAPTER XXIII

Trapped

"'Tain't quite all ship-shape, is it, sir?" enquired Petty Officer Chalmers, who, ignorant of the Russian language, could only base his surmise upon the fact that Klostivitch had suspiciously made himself scarce.

"I'm afraid not, Chalmers," replied Fordyce. "We took too much for granted, and pal Vladimir has sold us a dog. Don't move till I strike a match; there may be boobytraps about."

The glimmer of the lighted match revealed the lamp. Either by accident or design Klostivitch had left it on the floor.

"Proper Tower o' London sort of show," commented Chalmers, examining his surroundings by the feeble glare. "Look, sir, that's where the old rascal shinned up."

He indicated a number of iron rungs clamped into the wall, while immediately above was a square opening in the stone ceiling, over which had been lowered a huge block of granite.

"Come along, sir," continued the petty officer. "Let's get back to the steps. Maybe the slippery reptile hasn't had time to shut the door."

Quickly the two men ascended the flight of steps, only to find their exit barred by a securely bolted door. Vainly the burly petty officer thrust with his shoulder against the firmly-held barrier.