It was night; a lantern, held by a hand that shook slightly, revealed a face he did not know.  He felt assured, however, of his mental lucidity at the moment.  The new-comer, though a stranger, was undoubtedly flesh and blood.

“What do you want?” said the prisoner.

“A word with you, Monsieur.”  The speaker had a smooth face and dark soulful eyes.  His manner was both furtive and constrained.  He looked around as if uncomfortable at finding himself in that place.

“Well, I guess you can have it.  I can’t get away,” muttered the manacled man.

“Miss Dalrymple sent me.”

Mr. Heatherbloom’s interest was manifest; he strove to suppress outward signs of it.  “What—­what for?”

“She wanted to make sure you were not dead.”

The prisoner did not answer; his emotion was too great at the moment to permit his doing so.  She was in trouble, yet she considered the poor detective.  That was like her—­straight as a string—­true blue—­

The visitor started to go.  “Hold on!” said Mr. Heatherbloom, whose ideas were surging fast.  This youth had managed to come here at her instigation.  Had she made a friend of him, an ally?  He did not appear an heroic one, but he was, no doubt, the best that had offered.  Betty Dalrymple was not one to sit idly; she would seek ways and means.  She was clever, knew how to use those violet eyes. (Did not Mr. Heatherbloom himself remember?) Who was he—­this nocturnal caller?  Not an officer—­he was too young.  Cabin-boy, perhaps?  More likely the operator.  Mr. Heatherbloom had noticed that the yacht was provided with the wireless outfit.

“How long have I been here?” he now asked abruptly.

“It is three days since monsieur was knocked on the head.”

Mr. Heatherbloom looked down.  “Three days?  Well, it cost me a fortune,” he sighed, remembering the role of detective that had been thrust upon him.  “I could have stood for the sore head.”

The other had his foot at the threshold but he lingered.  “How much of a fortune?  What was the reward?” He strove to speak carelessly but there was a trace of eagerness in his tones.

“You mean what is it?” returned Mr. Heatherbloom, and named an amount large enough to make the soulful eyes open.  “And to think,” watchfully, “one little message to the shore might procure for the sender such a sum!”

“Monsieur!” Indignantly.  “You think that I would—­”

“Then you are the wireless operator?”

“I was.”  Francois spoke more calmly.  “His excellency has had the apparatus destroyed.  He will take no chances of other spies or detectives being aboard who might understand its use.”

The prisoner hardly heard the last words; for the moment he was concerned only with his disappointment.  A sudden hope had died almost as soon as it had been born.  “Too bad!” he murmured.  Then—­“How did you get here?”