The sound of the night-porter’s returning footsteps sent Allerdyke out into the corridor.  Unconsciously he shook his head and raised a hand—­as if to warn the man against noise.

“Sh!” he said, still acting and speaking mechanically.  “Here’s—­I knew something was wrong.  The fact is, my cousin’s dead!”

In his surprise the night-porter dropped the key which he had been to fetch.  When he straightened himself from picking it up, his ruddy face had paled.

“Dead!” he exclaimed in a whisper.  “Him!  Why, he looked the picture of health last night.  I noticed that of him, anyway!”

“He’s dead now,” said Allerdyke.  “He’s lying there dead.  Come in!”

The door along the corridor from which the man of the shock head and great beard had looked out, opened again, and the big head was protruded.  Its owner, seeing the two standing there, came out.

“Anything wrong?” he asked, advancing towards them in his pyjamas.  “If there’s any illness, I’m a medical man.  Can I be of use?”

Allerdyke turned sharply, looking the stranger well over.  He was not sure whether the man was an Englishman or a foreigner; he fancied that he detected a slightly foreign accent.  The tone was well-meaning, and even kindly.

“I’m obliged to you,” replied Allerdyke, in his characteristically blunt fashion.  “I’m afraid nobody can be of use.  The truth is, I came to join my cousin here, and I find him dead.  Seems to me he’s been dead some time.  As you’re a doctor, you can tell, of course.  Perhaps you’ll come in?”

He led the way back into the bedroom, the other two following closely behind him.  At sight of the dead man the bearded stranger uttered a sharp exclamation.

“Ah!” he said.  “Mr. Allerdyke!”

“You knew him, then?” demanded Marshall.  “You’ve met him?”

The other, who had stooped over the body, bestowing a light touch on face and hand, looked up and nodded.

“I came over with him from Christiania,” he answered.  “I met him there—­at a hotel.  I had several conversations with him.  In fact, I warned him.”

“Warned him?  Of what!” asked Allerdyke.

“Over-exertion,” replied the doctor quietly.  “I saw symptoms of heart-strain.  That was why I talked with him.  I gathered from what he told me that he was a man who lived a very strenuous life, and I warned him against doing too much.  He was not fitted for it.”

“Good Lord!” exclaimed Allerdyke, with obvious impatience.  “Why, I always considered him as one of the fittest men I ever knew!”

“Perhaps you did,” said the doctor.  “Laymen, sir, do not see what a trained eye sees.  The proof in his case is—­there!”

He pointed to the dead man, at whom the night-porter was staring with astonished eyes.

Allerdyke stared, too, or seemed to stare.  In reality, he was gazing into space, wondering about what had just been said.