“Nothing whatever. And the other—the addressee in the case?”
“Valkenburg? He is a Hollander by birth—a bona-fide dealer.”
“In diamonds?”
“In diamonds.”
“And known of course to Mr Hamlin?”
“Naturally. The enclosure in question was forwarded by Hamlin to him in the ordinary course of business.”
“But why by post? Hatton Garden and the Vauxhall Bridge Road—it was there this Valkenburg lived, wasn’t it?”
“Yes, number 41, B.”
“Well, they aren’t such leagues apart.”
The Superintendent shrugged his shoulders.