Chemist Eben Lamont (Ralph Osborne) invents a powerful new explosive, and to keep it out of enemy hands, he writes the formula in code on the shoulder of his daughter Grace (Grace Davison) with disappearing ink. After his death, a group allied with a foreign nation attempt to kidnap the girl. One of them is trying to double-cross the others, but the head of an explosive manufacturing company saves the girl from all of them and wins her heart -- not to mention the secret formula.
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