Bluebeard

Bluebeard was a rich aristocrat, shunned because of his "frightfully ugly" blue beard. He’d been married several times, but no-one knows what happened to his wives. He was therefore avoided by the local girls. Bluebeard persuaded the daughter of a neighbour to visit him. He then convinced her to marry him. After the ceremony she went to live with him in his château.
Very shortly after, Bluebeard announced that he must leave the country for a while; he gave the keys of the château to his new wife, telling her they open the doors to rooms which contain his treasures. He told her to use the keys freely, and enjoy herself whilst he is away. However, he also gave her the key to one small room beneath the castle, stressing to her that she must not enter the room under any circumstances. She vowed she would never enter the room. He then went away and left the house in her hands. Immediately she was tempted to go to the forbidden room and despite warnings from her visiting sister, Anne, the girl abandoned her guests during a party, and went to the room.

The wife discovered the room's secret: the floor was flooded with blood, and the murdered bodies of her husband's former wives hung from hooks on the walls. Horrified, she dropped the key into the pool of blood. She fled the room, but the blood staining the key wouldn’t wash off. She revealed her murderous husband's secret to her sister Anne, and both planned to flee the castle the next day. Bluebeard returned home unexpectedly the next morning, and, noticing the blood on the key, immediately knew his wife had broken her vow. In a blind rage he threatened to behead her on the spot, but she implores him to give her 15 mins to pray. He agrees, so she locked herself in the highest tower with Anne. While Bluebeard, sword in hand, tries to break down the door, the sisters waited for their two brothers to arrive. At the last moment, as Bluebeard is about to deliver the fatal blow, the brothers broke into the castle, and as he attempted to flee, they killed him. He left no heirs but his wife, who inherited his fortune. She used part of it for a dowry to marry off her sister, another part for her brothers' captains commissions, and the rest to marry a gentleman who’d make her forget her horrible encounter with Bluebeard.