A New York jeweler is thrust into international intrigue when a perfect diamond inexplicably appears in the mail

A breathtakingly flawless diamond is delivered to accomplished jeweler Harry Latham. Even though he is an expert in his trade, Latham is astonished by the stone’s perfection and cannot begin to fathom its value. The package containing this extraordinary gem did not include a message, instructions, or a return address—and Latham soon discovers that 4 other American jewelers received diamonds identical to it. In fact, even the most skilled among the recipients cannot discern a difference between the stones. Where did these diamonds come from? Who might have sent them? And to what end?