The Hillcrest Mystery (1918)

During a party held in honor of his daughter Marion, Thomas Sterling announces that he will turn over his shipbuilding plant to the United States government for the duration of World War I. Sterling wants Marion to marry his partner, Hugo Smith, but she prefers Gordon Brett, who proposes to her after the party. Marion's father catches the two in an embrace and orders Gordon out of the house. Later that night, Sterling is found murdered. Gordon is the principal suspect, but Marion refuses to believe he is guilty and hides him in the house. Later she discovers Smith sending a message to the Germans on a wireless hidden in the attic.