From the back of the book:
Strange things start to happen when Nancy enters a magazine contest with a solution to a true mystery. A century ago, an elegant Belgium [sic] gentleman, a secret pair of lace cuffs, and a priceless treasure all disappeared. Suddenly Nancy's contest entry is missing! A day later when another contestant submits the identical solution, Nancy sees there's a real mystery to be solved. Nancy, Bess, and George fly to Belgium in search of the truth. In a chilling adventure through hidden rooms, dark tunnels, and ghostly canals, the young sleuths get caught up in a romantic mystery of the past.
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