LONDON — The Frankfurt Book Fair, the international publishing industry’s biggest trade fair, has awarded its prize for best international literary adaptation to Todd Haynes’ “Carol.” The film’s screenplay was by Phyllis Nagy, and was based on Patricia Highsmith’s novel “The Price of Salt.”

“For years we’ve been successfully working on strengthening the collaboration between the publishing and film industries, and on continuously developing the potential it holds,” said Juergen Boos, director of the Frankfurt Book Fair. “With this prize, we want to put the spotlight on exceptional literary film adaptations — and on the literary originals that inspired these productions.”

The film, which is set in 1950s New York, centers on Carol Aird (Cate Blanchett), who is unhappily married to her wealthy husband, Harge (Kyle Chandler). She meets the young Therese (Rooney Mara), who works in a department store and dreams of a career as a photographer. During a trip they take together, a bond develops between the two women, ultimately blossoming into love.

“In elaborately composed shots, Todd Haynes revives the repressive atmosphere of the 1950s. With ‘Carol,’ he tells the love story of two women who defy society’s narrow moral values. As he did in ‘Far From Heaven,’ here Todd Haynes once again creates film on a grand emotional scale, without it feeling kitschy or sentimental,” said Boos.

The Frankfurt Book Fair attracts 7,100 exhibitors from more than 100 countries, 270,000 visitors, and 9,300 accredited journalists. The Book Fair, in cooperation with the Berlin Film Festival, also organizes the Books at Berlinale rights market during the festival in February.