Scarhaven Keep by J.S. Fletcher — Read

Copplestone carried the queer-looking missive into his private sitting-room and carefully examined it, back and front, before slitting it open. The envelope was of the cheapest kind, the big splotch of red wax at the flap had been pressed into flatness by the summary method of forcing a coarse-grained thumb upon it; the address was inscribed in ill-formed characters only too evidently made with difficulty by a bad pen, which seemed to have been dipped into watery ink at every third or fourth letter. And it read thus: --

"THE YOUNG GENTLEMAN STAYING AT 'THE ADMIRAL' -- PRIVATE"