Cast & Crew
After the death of her father, Beth is adopted by Henry Wagner, a German who has made his fortune in America. Beth believes herself in love with Wagner's American-born son Karl, although Frank Douglas, her school friend, is also in love with her. Following the United States' declaration of war against Germany, Karl returns home from Berlin where, in attending a German college, he had developed a strong loyalty to the German cause. When Karl drinks to the Kaiser's health, Henry denounces his son as a traitor, and later Beth overhears Karl making plans with Krug, a German spy, to blow up an American troop transport. While Krug plants a bomb on the ship, Karl imprisons Beth, but Frank, a Secret Service agent who has learned of the plot, fights off the band of spies and rescues her. The two wire the ship just in time to prevent the explosion, after which Karl and his cohorts are apprehended. Realizing that she has always loved Frank, Beth marries him.
Eric Von Stroheim
Modern sources note that D. W. Griffith, under the pseudonym Granville Warwick, wrote the script with S. E. V. Taylor and set up an independent organization called the F-4 Company in order to finance and produce it. After its completion, Griffith sold the film to the Famous Players-Lasky Corp. Footage left over from Griffith's Hearts of the World was used in the film. (see AFI Catalog of Feature Films, 1911-20; F1.1829). The picture's working title was F-4. It was first shown publicly on May 1, 1918 in Pasadena, CA under the title The Enemy Within. This was the first Paramount-Artcraft Special.