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This story takes place almost entirely against Christmas. Watson visits his friend Holmes, who examines an old hat (deducing its owner) brought to him by Commissioner Peterson and a Christmas goose that was lost by some man during a fight with street cutters. Subsequently, a blue carbuncle was found in the goose's throat - a rare precious ruby.

Holmes cannot resist such a unique mystery, and he and Watson begin to walk around different corners of London to discover how the stolen jewel ended up in the goose's throat.