Sarah Chardonnet is 45 years old and has three children. She was also the wife of Paul Chardonnet—nicknamed “Walker”—who has just died in a plane crash while piloting his own aircraft. A brilliant entrepreneur with an increasingly bright future ahead of him, Walker is suddenly gone. Now a widow, Sarah finds herself left in charge of FlyEuropExpress, a logistics firm that has become the European leader in express transport—a company that must somehow be kept running. It is with anger that she receives François Schneider, a private investigator specializing in missing persons, who has been commissioned by FlyEuropExpress’s insurance company to confirm that Walker is indeed dead. The fact is, no body has been recovered…