Could a mortifying day on the job end up netting you true love? When switchboard operator Mabel Jennings reports to work in the summer of 1964, she doesn't have any interest in finding love again. Out-of-towner Roy Stentz rings up her station, however, and makes her reconsider. Mabel's intrigued by his deep yet kind voice, but she endeavors to remain professional. Her attraction frazzles her mind, causing her to transfer Roy to the wrong line. When he calls back to give her another try, she repeats the mistake, humiliating herself. The haphazard introduction sets an unexpected romance into motion. Though she falls quickly for him, Mabel's bittersweet past refrains her from giving Roy her full devotion. Can she overcome her memories of love lost to embrace the new one calling out to her?