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Slim Callaghan is called to Devonshire to investigate a burglary at Margraud Manor, where valuable jewels – heirlooms of the Vendayne family insured for £100,000 – have disappeared.

With his assistant, Windermere Nikolls, he discovers some startling facts – particularly about the lovely Esme Vendayne – and the mystery leads Callaghan to a shady London nightclub and a violent underworld.