Betty and Anne giggled as they read the descriptions of potential mates on their dating apps. They remembered their mother's advice not to meet anyone alone, or to travel beyond their own town, or to believe the stories of wealth or uniform pictures of good looks. "Well, I will not settle for less than a millionaire" said Betty. Then Anne said "Look, here is the only ugly picture, a man with a blue beard, and he lives in that huge house on the edge of town. Wait, I'll get an invitation for us both.".
Bluebeard turned out to be suave and sophisticated, and held great parties in his richly-furnished mansion, and if anyone ever expressed any doubts about him, it was that no-one knew what had happened to his previous wives. Betty was won over by a life of material abundance, and agreed marriage. Bluebeard claimed he was going on a business trip and handed over the security system's master card. "Do not go into the panic room in the basement, else you'll be sorry, but otherwise have the run of the place, invite your friends round!" he told her. When Betty swiped the card in the panic room door, she did not immediately notice the card's strip had changed colour, she was too busy discovering that her new husband's favourite hobby was dismembering wives. Foolishly confronting him when he returned from his fake business trip, Betty couldn't hide the altered card, and Bluebeard chided her: "You have had your part of the bargain, and now I will have mine". But when she begged for pity, her sister Anne in the next room heard her, texted their brothers, who arrived just in time to do Bluebeard in with baseball bats.