The moving story of a small Texas town in 1918. Until an influenza epidemic hit and several broken young men returned from the war in Europe.

Two sisters have put aside their differences to set up a comfortable life together but when one of them falls in love with an Asian mechanic, her stuffy, intolerant sister falls into a rage that threatens to destroy their relationship.

On Valentine's Day is the central film in Horton Foote's semi-autobiographical trilogy that also includes Courtship and 1918. It is a nearly verbatim retelling of his stage play and the sets and costumes.