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Rh that sheer instinct prompted Lanyard to tread lightly as he made his way down the passage and across the courtyard toward the stairway; and in that hush the creak of a greaseless hinge, when the concierge opened the door of his quarters to identify this belated guest, seemed little less than a profanity.

Lanyard paused and delved into his pockets, nodding genially to the blowsy, sleepy old face beneath the guardian's nightcap.

"Sorry to disturb monsieur," he said politely, further impoverishing himself in the sum of five francs in witness to the sincerity of his regret.

"I thank monsieur; but what need to consider me? It's my duty. And what is one interruption more or less? All night they come and go.…"

"Good night, monsieur," Lanyard cut short the old man's garrulity; and went on up the stairs, now a little wearily, of a sudden newly conscious of his vast and enervating fatigue.

He thought longingly of bed, yawned involuntarily and, reaching his door, fumbled the key in a most unprofessional way; there were weights upon his eyelids, a heaviness in his brain.…

But the key met with no resistance from the wards; and in a trice, appreciating this fact, Lanyard was wide-awake again.

No question but that he had locked the door securely, on leaving after his adventure with the charming somnambulist.…

Had she, then, taken a whim to his room?

Or was this but proof of what he had anticipated in the beginning—a bit of sleuthing on the part of Roddy?