When a veteran 911 operator takes a life-altering call from a teenage girl who has just been abducted, she realizes that she must confront a killer from her past in order to save the girl's life.

In June 1917, General John Pershing arrived in France to establish American forces in Europe. He immediately found himself unable to communicate with troops in the field. Pershing needed operators who could swiftly and accurately connect multiple calls, speak fluent French and English, remain steady under fire, and be utterly discreet, since the calls often conveyed classified information. At the time, nearly all well-trained American telephone operators...