Rolfe had left Scotland Yard that evening in a somewhat despondent frame of mind in consequence, but a brisk walk home and a good supper had done him so much good, that with a tranquil mind and his pipe in his mouth, he was able to devote himself to the hobby of his leisure hours with keen enjoyment.
This hobby would have excited the wondering contempt of Joe Leaver, whose frequent attendance at cinema theatres had led him to the conclusion that police detectives—who, unlike his master, had to take the rough with the smooth—spent their spare time practising revolver shooting, and throwing daggers at an ace of hearts on the wall. Rolfe's hobby was nothing more exciting than stamp collecting. He was deeply versed in the lore of stamps, and his private ambition was to become the possessor of a "blue Mauritius." His collection, though extensive, was by no means of fabulous value, being made up chiefly of modest purchases from the stamp collecting shops, and finds in the waste-paper-baskets at Scotland Yard after the arrival of the foreign mails.
That day he had made a particularly good haul from the waste-paper-baskets, for his "catch" included several comparatively good specimens from Japan and Fiji. He sat gloating over these treasures, examining them carefully and holding each one up to the light as he separated it from the piece of paper to which it had been affixed. He pasted them one by one in his stamp album with loving, lingering fingers, adjusting each stamp in its little square in the book with meticulous care. He was so absorbed in this occupation that he did not hear the ascending footsteps drawing nearer to his door, and did not see a visitor at the door when the footsteps ceased. It was Crewe's voice that recalled him back from the stamp collector's imaginary world.
"Why, Mr. Crewe," said Rolfe, with evident pleasure, "who'd have thought of seeing you?"
"Your landlady asked me if I'd come up myself," said Crewe, in explaining his intrusion. "She's 'too much worried and put about, to say nothing of having a bad back,' to show me upstairs."
"I've never known her to be well," said Rolfe, with a laugh. "Every morning when she brings up my breakfast I've got to hear details of her bad back which should be kept for the confidential ear of the doctor. But she regards me as a son, I think—I've been here so long. But now you are here, Mr. Crewe—" Rolfe waited in polite expectation that his visitor would disclose the object of his visit.
But Crewe seemed in no hurry to do so. He produced his cigar case and offered Rolfe a cigar, which the latter accepted with a pleasant recollection of the excellent flavour of the cigars the private detective kept. When each of them had his cigar well alight, Crewe glanced at the open stamp album and commenced talking about stamps. It was a subject which Rolfe was always willing to discuss. Crewe declared that he was an ignorant outsider as far as stamps were concerned, but he professed to have a respectful admiration for those who immersed themselves in such a fascinating subject. Rolfe, with the fervid egoism of the collector, talked about stamps for half an hour without recalling that his visitor must have come to talk about something else.
"I've got a small stamp collection in my office," said Crewe, when Rolfe paused for a moment. "It belonged to that Jewish diamond merchant who was shot in Hatton Gardens two years ago. You remember his case?"
"Rather! That was a smart bit of work of yours, Mr. Crewe, in laying your hands on the woman who did it and getting back the diamond."
Crewe smiled in response.