The Adventure of the Blue Carbuncle by Arthur Conan Doyle

When a rare and valuable gemstone is discovered in the crop of a Christmas goose, Sherlock Holmes follows a trail of lost hats, market stalls, and urban secrets. The case takes a surprising turn as it exposes both petty crime and deeper human motives. The plot is light and festive, blending comedy with mystery. Holmes's compassion in resolving the case adds emotional nuance. It's a charming holiday-themed puzzle with a moral twist.