With puzzled face, Dunbar opened the envelope and withdrew the commissioner's note. It was very brief:—
“M. Gaston Max, of the Paris Police, is joining you in the Palace Mansions murder case. You will cooperate with him from date above.”
“MAX!” said Dunbar, gazing astoundedly at his subordinate.
Certainly it was a name which might well account for the amazement written upon the inspector's face; for it was the name of admittedly the greatest criminal investigator in Europe!
“What the devil has the case to do with the French police?” muttered Sowerby, his ruddy countenance exhibiting a whole history of wonderment.
The constable, who had withdrawn, now reappeared, knocking deferentially upon the door, throwing it open, and announcing:
“Mr. Gaston Max, to see Detective-Inspector Dunbar.”
Bowing courteously upon the threshold, appeared a figure in a dazzling check traveling-coat—a figure very novel, and wholly unforgettable.
“I am honored to meet a distinguished London colleague,” he said in perfect English, with a faint American accent.
Dunbar stepped across the room with outstretched hand, and cordially shook that of the famous Frenchman.