The Unknown Quantity

From a Grand Master Award–winning author, a wife is drawn into her husband's business world of secrets and lies—and murder—in this thrilling mystery.

Sarah Travers's husband Arthur asked her to meet him in San Francisco, where he's engaged in business related to his oil company, and is shocked to meet his newest employee. Lawyer Jake Dixon looks almost exactly like her husband. Arthur has been contracted by the government for covert work and hired Jake to impersonate him during his absence....