The Water Spectre

Muchardus, the usurping Thane of Dungivan, had murdered Roderic the late owner of that title, whom he had treacherously invited to an entertainment in a castle that he possessed on the banks of the Clyde. As soon as the banquet was nearly concluded, Roderic arose, courteously took leave of his entertainer and his guests, and descended the stairs. But he was not allowed to quit Boswell Castle. His faithful followers had been previously dispatched, and buried in one of the vaults beneath the edifice. To one of these, which was formed into a kind of dungeon, the hapless Roderic was forcibly dragged, and fastened to the stone wall by an iron chain.
Three days and nights did the unfortunate Roderic remain in this wretched lodging; his bed the cold ground, with oaten cake and water for food; and this vile treatment he received from one on whom he had heaped innumerable favors, and honored with his confidence.
On the fourth night of Roderic's dreadful confinement, Muchardus entered his dungeon; in one hand he carried a written paper, in the other a dagger; the man who had always brought Roderic's food, carried a torch before the recreant lord. Roderic surveyed his foe with silent indignation.