- Having perfected the most powerful explosive in the world, General Tremont is beset by spies of foreign governments. To safeguard the formula he contrives a device which will explode when the safe is opened by anyone save himself. Hans, a foreign agent, attempts to enter the laboratory and is surprised by the general, whom he kills. The explosion of the safe blows off the thief's right band. Laforet, the detective put on the case, finds the severed hand and removes from one finger a ring engraved with the name "Hans." The detective learns that a mysterious woman visited the general on the night of his death, and sets out to trace her. She is the Baroness Sophia Grodsko, a secret agent associated with Hans and Agostini, the head of the secret service. Sophia learns that Marcel Bradier, a young chemist, son of the general's wealthy friend, has been associated with General Tremont and has received from him a copy of the formula. She contrives to meet Marcel and he falls in love with her. By ingratiating herself into the laboratory she learns where he keeps the formula and throws a warning note to Hans, who, disguised as a fisherman, is waiting in a boat on the river below. But immediately, an opportunity to secure the formula presents itself, and she takes it. Marcel goes walking with her. Hans gets fire to the factory and is caught by Laforet, who has used the ring as a clue. Hans gets away, reaches the laboratory, and in the presence of fellow conspirators, discovers that the formula is not in its hiding place. Sophia does not give up the formula, for she loves Marcel and has only stolen the secret to prevent it falling into her fellow conspirators' hands. Agostini and Hans suspect her, and she sends Marcel warning to keep away from the villa to which they would lure him in her name. But he comes and is trapped in her room. He turns upon her, until she proves her love by giving him the formula. His father and friends arrive and rescue him after capturing the secret agents. Sophia dies.—Moving Picture World synopsis
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