You Can't Keep the Change

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, which leads him to a shady London nightclub and a violent underworld."