The Heart of a Mystery...

On a certain bitter December evening, when the present century was several years younger than it is now, Miss Pengarvon, of Broome, in the shire of Derby, sat in the Green Parlor at the Hall, working by candle-light at some piece of delicate embroidery. The fingers of the old case-clock pointed to half-past ten--an exceptionally late hour in that remote place. Miss Pengarvon was alone. Her sister, Miss Letitia, had been suffering from neuralgic pains in the head, and had retired an hour ago. Bar