When Katie answers the call of duty, she awakens the call of her heart. Katie Russell loves working as a telephone operator in Mercy Falls, California. But since childhood she has been expected to marry well. Her family presses for an engagement to wealthy bachelor Bartholomew Foster and though he doesn't stir her heart, their engagement promises a secure financial future. Working the phone lines one evening, Katie overhears a chilling exchange between her friend Eliza and a familiar male voic