Condé B. Pallen

A priest is trying to help a poor family when nearby the father is hit on the head by a criminal who then throws him off a bridge into the water below. The priest administers Last Rites then seeks to help the family and find the murderer.

J.H. Wareing, a New York City financier, is found murdered in his library after the robbery of several securities and a necklace. Suspicion points to the butler, Jason, to whom Wareing had shown the necklace the night before. Wareing's daughter, Florence, is also a suspect and therefore denied her father's estate.

Mary Herder is the private secretary of the junior member of the New York contracting firm of Thompson and Collins. When she learns of a plot by the firm's foreman, a Bolshevist, to blow up a ship that Collins, who once rescued a worker from the foreman's violence and who is active against Bolshevism, is visiting, she and her older brother Charles thwart the conspirators' plans. During the war, Charles is rescued by Collins, while the Knights of Columbus, under the Rev. Francis Kelly, help American boys. After the war, Charles, a victim of shell-shock, recovers when he holds his baby. Mary's younger brother Frank, a Secret Service man posing as a Bolshevist, learns of their plan to overthrow the government. After they suspect Frank and kidnap Mary and others, Frank and Collins, with members of his regiment, rescue them in the nick of time.