The boat is filling with water -- a tense moment. Cleo, remembering that Hope had shown her the lever that opens the trap in the conning tower, rushes to the lever, throws it over and thus closes the trap, stopping the inrush of water. Burke turns his attention to his invention, and just as the party is about to succumb to suffocation, he manages to get the apparatus working and the supply of air is renewed. The boat is rising and the party regains its spirits. In the meantime Satsuma, the Jap, has reached the shore. Morton, the emissary of Montgomery, has arrived in the city to purchase the invention. Burke tells him the test of the invention has been completely successful. He tells him the United States government is negotiating for the invention and declines to have any dealing with Morton. Cleo, passing the window, gives Morton an idea. Adroitly indicating Cleo, he asks Burke, "Is the submarine secret the only one you possess?" Burke is visibly affected by the shot and promises to see Morton later. Satsuma meantime has reported to Mahlin, and Sextus receives orders from Olga Ivanhoff to obtain the secret at all cost. Thus a few nights later, Satsuma and Sextus each gain entrance to the Burke home to search for the secret. In the dim light the two men meet and grapple, each thinking his opponent is a member of the household. The fight is terrific and both are hurt, but manage to escape. The midnight battle puzzles the Burke household, for no attempt had been made at robbery. It is deemed best not to call the police. The next morning Hope is apprised of the fight, and Burke tells Cleo of the receipt of an anonymous letter containing a veiled threat on his life if he does not meet the writer and sell him the submarine secret. In the meantime Hope reports favorably upon the discovery to the government and is informed a check will be sent him to constitute first payment for the secret. Burke, in the darkness of that night, is known to visit the library, where at a late hour he is depositing small slips of paper into various volumes. He goes to his den and writes, engaged, apparently, upon a task of vital import. The next morning Cleo calls her father to breakfast, but he does not respond. She goes to his room. His bed has not been slept in. She is alarmed and hurries to his workshop and then to his den, on the floor of which she discovers his dead body. -Exhibitor's Herald, June 3, 1916.
See Episode One for cast listing.