Lambert of Fürstenberg was a hearty jovial knight, and had married Wiltrud, a daughter of the Florsheim family. He was attached to his gentle wife, who had just presented him with a son and heir. But an evil genius entered the castle in the person of a noble maiden called Luckharde. This maiden who had suddenly been left an orphan, belonged to a family long befriended by the house of Fürstenberg. She was only eighteen, but possessed a lascivious beauty, very dangerous to men.

The lady of the castle, who had been in delicate health since the birth of her child, gave Luckharde a warm-hearted welcome into the bosom of her family, trusting that the young woman would be of great service to her in the management of her little realm, and would repay her kindness by sisterly love and sympathy. Luckharde however was of a vain and frivolous disposition, and had little love for household affairs, or womanly duties.

As the months passed, Luckharde's ripening and dangerous beauty gained gradually and almost imperceptibly more and more influence over the susceptible heart of the lord of the castle, and soon the day came when he yielded himself entirely to the charms of this beautiful woman. Wiltrud's eyes were by no means blind to the shameful ingratitude of the adulteress, and the godless conduct of her husband. Her weakness however, prevented her from calling down the judgment of heaven on the sinners. Luckharde, led on by her unbridled passion, now formed a devilish design which would enable her to take the place of the lawful wife of Lambert. One night she slipped into the chamber of the lady of the castle, approached the bed of the sleeping woman with a cat-like step, and smothered her with the pillows, the poor invalid offering but a feeble and ineffective resistance.