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Vera Knight becomes an assistant to biologist Madame Bartlett, and has an affair with her secretary, Paul Chilton. When Vera becomes pregnant but Chilton refuses to marry her, Madame Bartlett tries to force Chilton to do the right thing. They quarrel and Chilton kills the biologist, but Vera is accused of the crime and is convicted of murder. Her newborn child Walter goes to live on a farm and grows up thinking that the farmer and his wife are his parents. He eventually becomes a successful businessman and plans to marry the daughter of Senator Bristow. Meanwhile, after foiling a jailbreak, Vera is released from prison and becomes a secret agent on the trail of a spy trying to steal government secrets from Bristow. The spy turns out to be Chilton, and in the end, Chilton is killed in a train derailment and Vera and Walter are reunited.