"Mary Russell and Sherlock Holmes turn the Riviera upside-down to crack their most captivating case yet in the New York Times bestselling series that Lee Child called "the most sustained feat of imagination in mystery fiction today." It's summertime on the Riviera, where the Jazz Age is busily reinventing the holiday delights of warm days on golden sand and cool nights on terraces and dance floors. Just up the coast lies a more traditional pleasure...