It's 1952. The switchboard operators in Wooster, Ohio, love nothing more than to eavesdrop on their neighbours' conversations, and gossip about what they learn. Vivian Dalton is no different (despite her teenage daughter's disapproval), and always longs to hear something scandalous. But on the night of December 15th, she wishes she hadn't. The secret that's shared by a stranger on the line threatens to rip the rug of Vivian's life from under her.