Ten deputy sheriffs (deputies) (plaintiffs) were at-will employees of the Board of County Commissioners for Carter County (Board) (defendant). According to a personnel handbook distributed by the Board, county employees, including law-enforcement personnel, were entitled to overtime pay. Although the handbook included a disclaimer stating that the policies in the handbook did not represent an employment contract, some other sheriff employees received overtime pay pursuant to the personnel handbook. The deputies sued the Board for overtime pay, arguing that the overtime-pay policy set forth in the handbook had become part of their at-will employment contracts. The trial court granted summary judgment to the Board. The court of civil appeals reversed. The Board petitioned for certiorari.