Episode 1: "The Lost Torpedo" Craig Kennedy's marvelous invention, a super-force torpedo to revolutionize warfare, has been stolen. Kennedy himself has disappeared, although Elaine has a note from him begging her not to grieve whatever happens, for he is safe. And then, one night, on a barren strip of land jutting out into the Atlantic, a fisherman, concealed behind a rock, sees the periscope of a submarine rise; sees a man's head and shoulders rise seemingly out of the sea, and sees a pair of athletic arms strike out bravely for the shore. That night, at a hotel in New York, a distinguished-looking foreigner, much resembling the man who seemed to rise up out of the sea, is shadowed by a fussy old gentleman resembling the fisherman of the coast scenes. The foreigner goes out and the fussy old gentleman goes to his room, where, after a short, sharp struggle with a valet, he searches through all drawers and papers. One paper he pockets with glee, and then departs. Elaine and Jameson are visited by the distinguished-looking foreigner who tells them he is a secret service agent from Washington, and begs to get information with regard to Kennedy and the lost torpedo. Elaine's dog, digging with its forepaws in a pot of palms, unearths the lost torpedo and carries it to the attic, where he drops it behind a trunk. The torpedo's propeller, however, has been left in the palm-pot. where Marcius Del Mar, the foreigner, finds it. Elaine is suspected by him of having concealed the torpedo. The fussy old gentleman, in Del Mar's tracks since he left his rooms, is an interested spectator. He is unaware that Del Mar has spies guarding the house, and is set upon by them. Rushing madly into the conservatory, he faces Del Mar. Both draw their guns, but the fussy old gentleman fires first. His gun is loaded with bullets containing an overpowering gas. Both Del Mar and Elaine fall suffocated to the floor. How the fussy old gentleman escapes is a fitting climax to this episode.—Moving Picture World synopsis

Episode 2: "The Gray Friar" Elaine, informed by a note from her fiancé, Craig Kennedy, that he is still alive and to be figured with, decides to give a masquerade party to celebrate her joy. To this party Del Mar, foreign spy, who professes to be in the United States Government service, is invited. He manages to pass in some of his accomplices, and together they try to locate Kennedy's lost torpedo. There is a little Gray Friar in the party, however, and he keeps them constantly in sight, and overpowers Del Mar after the secret agent forces open a safe in Elaine's bedroom. When Del Mar is discovered, bound, before the opened safe, he explains his position by claiming to have been overpowered by some secret agents when he tried to apprehend them in their investigation. He then persuades Elaine to employ a young woman, an accomplice of his, as maid, saying that he fears the intrigues of spies in the household. Elaine, struck with the honesty of the girl's appearance, hires her. The new maid discovers the lost torpedo in the garret where Elaine's dog brought it a few days before. Hearing Elaine approach, she hurriedly packs it in her trunk, and leaves the room. Elaine, not able to close her trunk, removes the tray containing the torpedo, and substitutes for it a tray from another trunk. The climax of this story comes in the scene immediately following, when a freight train, an automobile, and four men at cross purposes figure in the destiny of the coveted trunk. One of the men eventually gets it, only to find the missing torpedo still missing.—Moving Picture World synopsis

Episode 3: "The Vanishing Man" Marcus Del Mar, a foreign agent, searching for Craig Kennedy's lost torpedo, and posing to Elaine as an investigator in search of Kennedy, takes up his headquarters close to Elaine's summer home. Elaine, Jameson and Del Mar, while standing on the lawn of the Dodge summer home, are surprised to receive from a farmer Elaine's missing trunk. Elaine and Jameson thank the farmer very cordially and he throws Elaine an apple and departs. Elaine is dumbfounded to find a note cleverly concealed in the apple. It reads: "Be careful of Del Mar." She slowly tears it into small pieces and, thinking she is not observed, throws it away. But Del Mar has noticed, and recovering the torn parts pieces them together and reads. Elaine discovers the lost torpedo in the tray of her trunk and goes quickly to tell Jameson of it. While she is gone, one of Del Mar's men steals the torpedo and is making off with it when he is intercepted by the farmer who threw Elaine the apple containing the warning. They struggle, and in the fight the farmer manages to destroy the torpedo, much to the rage of Del Mar, who comes up just a moment too late to save it. Del Mar sends a note to his agents as follows: "Install submarine bell. Am mining harbors and bridges as per instructions from government." Great bridges and harbors are being secretly prepared for destruction by Del Mar and his assistants. Elaine and Jameson, out for an auto spin, are compelled to scramble down some huge boulders to the seashore to chase Jameson's hat, and Elaine comes accidentally upon evidence of the wreckers. She starts away quickly, and as she does so a heliograph signal is flashed to the bridge wreckers to blow up the first bridge she attempts to cross. The message is received, not only by the wreckers, but by the seemingly innocent farmer, who manages always to be near Elaine in times of her utmost peril. She and Jameson in her car start to cross the bridge. A description of the end fills its purpose, and the best way to get a knowledge of the closing episode is to see the picture.—Moving Picture World synopsis

Episode 4: "The Submarine Harbor" Marcus Del Mar, a foreign agent, posing to Elaine as an investigator in search of the lost Craig Kennedy, returns from a mysterious mission. He enters his rooms through a secret panel, a diver's helmet in his hands, and his clothes soaking wet. A message awaits him informing him that Elaine is in possession of incriminating evidence against the harbor miners. Del Mar visits Elaine and Jameson, and learns that Jameson is about to post the damaging information to the government. He quickly communicates with his men, who intercept Jameson, and steal the communication which is delivered to Del Mar. In the fields nearby, a busy naturalist in smoked glasses, covertly watches Del Mar as he receives the message from his subordinate. Del Mar starts in his motorboat, and when he has a few minutes' start, is followed by the naturalist, who suddenly becomes unnaturally spry as he jumps into another motorboat and starts to follow. Del Mar discovers he is followed, and quickly donning a diver's suit slips unobserved into the water. He enters his headquarters through an underwater passage, and immediately joins, in a private chamber, a meeting of foreign secret service agents. Taking his place at the head of the table, he picks up a map, and pointing to a certain spot thereon, speaks: "If we hold this section, we hold America." Elaine, out for a ride, sees evidences of Jameson's struggle, and tracking him to the bridge wrecker's cave, rescues him in a sensational manner. They are about to leave the cave, when out from behind a rock a man's head and shoulders rise cautiously and a man's arm, pointing a revolver, rises to a level with Elaine's heart. At the same moment, another man, a naturalist in smoked glasses, rises up behind the man with the leveled gun. The climax is tense and thrilling.—Moving Picture World synopsis

Episode 5: "The Conspirators" At Fort Dale, Lieut. Woodward receives an invitation from Elaine Dodge to attend a house party she is to give that night. At the same time he receives a visit from on old man with a dark, heavy beard and spectacles. This man whispers something to Woodward, who starts in amazement and then answers Elaine's note begging permission to bring his friend, Prof. Arnold. Marcus Del Mar, a foreign agent, posing to Elaine as an investigator in search of the lost Craig Kennedy, plans with his fellow-conspirators to cut the great Atlantic cable. That night at the party Elaine discovers a note thrown away by Del Mar. It is undecipherable to her at first, as it represents only a crudely drawn sunrise on the ocean. She is finally struck with the idea that this drawing may represent something of moment to happen on the sea at sunrise the following morning, and prepares to investigate. After the ball, Prof. Arnold, suspecting Del Mar of trickery, goes to his rooms to search for certain papers. He is surprised in his search by Del Mar, and has to use all of his ingenuity to outwit the foreign agent. The next morning Elaine rises early, and going down to the ocean, interests herself in the actions of a boat off shore. This is Del Mar's ship, being used on his cable cutting exploit. Del Mar sees her watching, and has her captured and taken aboard. Jameson, off for a fishing trip, sees Elaine's plight, but being alone, is powerless to help her. Rushing off to Fort Dale, he explains the whole situation to Capt. Burnside of the U.S. Aerial Corps. Burnside and Jameson jump into a hydro-aeroplane and start off to the rescue. Lieutenant Woodward and Professor Arnold, out for a horseback ride, see Del Mar's crew haul the Atlantic cable on deck preparatory to cutting it. Woodward gallops off to Fort Dale, where he secures a company of soldiers and a field gun, and starts back to bombard the ship. Elaine in the foreigner's ship, the ship bombarded by a field gun and a company of U.S. soldiers, the Atlantic cable about to be severed, and a hydro-aeroplane about to descend, do not these things make a climax you are anxious to see? It's all on the film.—Moving Picture World synopsis