The Familiar by Joseph Thomas Sheridan Le Fanu

MR. BARTON was next morning sitting at a late breakfast, reflecting upon the incidents of the previous night, with more of inquisitiveness than awe, so speedily do gloomy impressions upon the fancy disappear under the cheerful influence of day, when a letter just delivered by the postman was placed upon the table before him.

There was nothing remarkable in the address of this missive, except that it was written in a hand which he did not know--perhaps it was disguised--for the tall narrow characters were sloped backward; and with the self-inflicted suspense which we often see practised in such cases he puzzled over the inscription for a full minute before he broke the seal.