Based on the true World War II story of the heroic librarians at the American Library in Paris. Paris, 1939: Young and ambitious Odile Souchet has it all: her handsome police officer beau and a dream job at the American Library in Paris. When the Nazis march into Paris, Odile stands to lose everything she holds dear, including her beloved library. Montana, 1983: Lily is a lonely teenager looking for adventure in small-town Montana. Her interest is piqued by her solitary, elderly neighbor. As Lily uncovers more about her neighbor's mysterious past, she finds that they share a love of language, the same longings, and the same intense jealousy, never suspecting that a dark secret from the past connects them.