I'm a big fan of the BBC Sherlock series, and I thought the iconic 221B Baker Street flat would be the perfect subject to render in gingerbread for the Portsmouth Historical Society's annual gingerbread contest.

A keyhole opening in the side wall reveals a detailed diorama of Sherlock's sitting room and the creative use of LED lighting—the only non-edible component allowed in the contest entries. A fire flickers in the fireplace and a chilling message from Moriarty is revealed with the help of a UV LED light, UV-reactive food coloring, and an Arduino microcontroller hidden in the base of the house.

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Holmes for the Holidays won first place in the adult category and Most Attention to Detail in the People's Choice awards.