I suppose those two Chinamen are unofficially connected with the Embassy.

At any rate, the man with them, the little man in a blue serge suit and straw hat, is Furneaux of Scotland Yard, a pocket marvel among detectives, the sort of criminal-hunter you read about in Gaboriau, but can scarcely accept as existing in real life." From that instant he bent his wits to the task of acquainting Mrs.
Paxton with the history of the preceding three days.

He was aware of the irrepressible trembling which shook her slender frame when he spoke of the ivory skull found in Edith Lester's underbodice, and the replica of the same grewsome token sent to Forbes, so suppressed all mention of his own experiences on returning to Innesmore Mansions overnight.
Furneaux had asked him for the bit of ivory that morning, and, incidentally, had produced the others from his pocket.

The detective gave no reason for his eagerness to possess these trophies, but seemed to invest them with great importance.

While keeping up a constant flow of talk with his sister, Theydon tried to puzzle out the detective's motive for carrying such sinister messengers of death around London.
Try as he might, he could arrive at no plausible explanation, but he did not make the error of attributing Furneaux's action to mere impulse.
Those men of the Yard had a solid foundation for every step they took.
Even the visit to Smith's Hotel, and subsequent departure in the gray car, meant a definite stride onward in the fight against Wong Li Fu.