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A silent film save for a synchronized Movietone score, True Heaven is a WWI espionage yarn, tailored to the talents of he-man George O'Brien. Hero Phillip Gresson (O'Brien) is in the employ of the British secret service, while heroine Judith (Lois Moran) is a spy for the Enemy. Hoping to gain possession of the usual Secret Plans, Judith pretends to be in love with Phillip. Only after nursing the seriously wounded Phillip back to health does Judith come to the realization that she genuinely loves him. This results in a moral dilemma when Phillip is arrested by Judith's superiors and sentenced to be shot. All that saves Phillip from the firing squad is the signing of the Armistice, which also permits hero and heroine to forget their nationalistic differences for good and all.