"Bluebeard" is a French folktale about a wealthy man with a mysterious past and a blue beard. He has been married several times, but his wives have all disappeared under suspicious circumstances. When he marries a young woman, he gives her the keys to his castle but forbids her from entering one particular room. Curiosity gets the better of her, and she eventually opens the forbidden door, discovering the truth about her husband's previous wives. The story explores themes of curiosity, trust, and the consequences of disobedience, making it a cautionary tale about the dangers of secrets and betrayal.