Jordan Turner (Halle Berry) is a 911 operator in the Hive -- the bustling Los Angeles headquarters for emergency operators. Her job is extraordinarily stressful, though the camaraderie she shares with co-workers Flora (Denise Dowse) and Marco (José Zúñiga) helps Jordan to stay sharp and focused during those long nights on the phone. The veteran operator experiences a debilitating bout of self-doubt, however, after making a thoughtless mistake that results in the brutal murder of a young girl at the hands of a sadistic prowler. Six months later, Jordan is taking a group of young trainees on a tour of the Hive when an inexperienced operator receives a frantic call from Casey (Abigail Breslin), a terrified teen who is locked in the trunk of a speeding car after being abducted in a parking lot. Unfortunately, Casey is calling from a disposable phone with no chip, making it impossible for the operator to trace the call.