The latest Daniel Jacobus mystery holds a mirror to the glittery fa ade of the concert world, delving into the multimillion-dollar sleight-of-hand of violin dealing . . . When an anxious phone call from obscure violinmaker Amadeo Borlotti disturbs Daniel Jacobus's Christmas Eve festivities, he and his dear friends Nathaniel and Yumi make light of it. A seemingly humble practitioner of his craft, Borlotti preferred the quiet...