The Unknown Quantity (1919)

Mary Boyne, who made shirts at four dollars a week, had no place for love in her life - only despair and hate for the son of the man who had plunged her family into deepest distress. Peter Kenwitz loved Mary, but because he was a mathematician and a pessimist by trade, his love was as hopeless as her chance for happiness.

The Unknown Quantity is a 1919 movie. Genres: Drama. Directed by Thomas R. Mills. Main cast: Corinne Griffith, Huntley Gordon, Harry Davenport, Jack McLean, Jack Ridgeway. Runtime: 50 minutes. Its average rating is 8.0 out of 10, from 1 votes.