The duchess was not only a believer in the existence of a sunken treasure of alluring proportions; she also believed that she knew of a method by which the said treasure might be precisely located and cheaply disembedded. An aunt on her mother’s side of the family had been Maid of Honour at the Court of Monaco, and had taken a respectful interest in the deep-sea researches in which the Throne of that country, impatient perhaps of its terrestrial restrictions, was wont to immerse itself. It was through the instrumentality of this relative that the duchess learned of an invention, perfected and very nearly patented by a Monegaskan savant, by means of which the home-life of the Mediterranean sardine might be studied at a depth of many fathoms in a cold white light of more than ballroom brilliancy. Implicated in this invention (and, in the duchess’s eyes, the most attractive part of it) was an electric suction dredge, specially designed for dragging to the surface such objects of interest and value as might be found in the more accessible levels of the ocean-bed. The rights of the invention were to be acquired for a matter of eighteen hundred francs, and the apparatus for a few thousand more.