Greatest Power (1917)

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With financial help from Randolph Monroe (Frank Currier), chemist John Conrad (William B. Davidson) invents a high explosive. He is assisted in his efforts by Monroe's daughter Miriam (Ethel Barrymore), and they fall in love. Conrad hopes to sell his explosives to every nation with the assumption that the horror of its effects would bring an end to the Great War (keep in mind that this was long before the invention of the atom bomb). But when the U.S. gets involved in Europe, Miriam tries to convince him that his invention should stay in his own country. Only when spy Albert Bernard (Harry S. Northrup) tries to get the formula does Conrad come around to Miriam's way of thinking. The U.S. really had just entered the war when this film was released, and soon theaters would be overloaded with pictures just like this one.