"Good heavens!" he managed to articulate, "how do you know?"
"Isn't that what you wanted of me?" asked Carrados suavely.
"Don't humbug, Max," said Carlyle severely. "This is no joke." An undefined mistrust of his own powers suddenly possessed him in the presence of this mystery. "How do you come to know of Nina Brun and Lord Seastoke?"
"You are a detective, Louis," replied Carrados. "How does one know these things? By using one's eyes and putting two and two together."
Carlyle groaned and flung out an arm petulantly.
"Is it all bunkum, Max? Do you really see all the time—though that doesn't go very far towards explaining it."
"Like Vidal, I see very well—at close quarters," replied Carrados, lightly running a forefinger along the inscription on the tetradrachm. "For longer range I keep another pair of eyes. Would you like to test them?"
Mr. Carlyle's assent was not very gracious; it was, in fact, faintly sulky. He was suffering the annoyance of feeling distinctly unimpressive in his own department; but he was also curious.
"The bell is just behind you, if you don't mind," said his host.
"Parkinson will appear. You might take note of him while he is in."
The man who had admitted Mr. Carlyle proved to be Parkinson.